JP4670651B2 - Shift control device for automatic transmission - Google Patents

Description

  The present invention relates to a shift control device for an automatic transmission mounted on a vehicle such as an automobile, and more particularly, to a shift control for an automatic transmission capable of learning a command value of hydraulic pressure supplied to a hydraulic servo of a friction engagement element. Relates to the device.

  In general, in an automatic transmission mounted on a vehicle or the like, in particular, a stepped automatic transmission, a gear shift is performed by gripping frictional engagement elements (clutch and brake). Shifting is controlled by hydraulically controlling the hydraulic pressure supplied to the hydraulic servo of these friction engagement elements using a linear solenoid valve or the like based on a hydraulic pressure command value calculated according to the rotational speed of the input shaft and the engine output. Has been.

  In such a shift control device for an automatic transmission, a learning value (correction value) for correcting the hydraulic pressure command value is provided in order to compensate for a product error or a change with time in the automatic transmission. Based on this, the learning value is calculated and recorded, and so-called learning control is performed in which the learning value is reflected in the hydraulic pressure command value in the next shift (see Patent Document 1).

JP 2004-293593 A

  By the way, oil (that is, ATF) used for an automatic transmission has a property that viscosity increases when temperature is low. For this reason, when the oil temperature is low (low temperature state) in the oil temperature region state (normal temperature state) used in the normal running state, if the shift control is performed with the hydraulic command in the same learning state as at normal temperature, There is a possibility that a shift shock or the like may occur due to a delay in response of the hydraulic pressure.

  Therefore, a learning value for low temperature is provided for further correction based on the learning value learned in the normal temperature shift, so that the low temperature learning value is learned so that a shift shock or the like does not occur even in the low temperature shift. Can be considered. In this way, the learning value in the normal temperature state in which the viscosity of the oil is lower than the low temperature state is used as the base of the learning value for the low temperature shifting, and the finer adjustment is made by the learning value for low temperature, thereby achieving a more reliable shifting. It will be possible to perform control.

  However, when the vehicle equipped with the automatic transmission is used only in an environment where the temperature is low, for example, when the vehicle is used only for short-distance driving (when the driving is often stopped before the oil temperature becomes high). In other words, in the state where the number of shifts in the normal temperature state is small, learning of the learning value in the normal temperature state, which is the base of the learning value in the low temperature state shift described above, does not proceed, and the low temperature learning value for fine adjustment There is a problem that shift quality is not improved by learning alone.

  Therefore, based on the oil temperature, the shift is discriminated between the low-temperature shift and the normal-temperature shift, and the learning value for the low-temperature shift and the learning value for the normal-temperature shift are separately learned, as described above. Even in a state where the number of shifts in the normal temperature state is small, it is conceivable to improve the shift quality of the shift in the low temperature state by advancing learning in the learning value of the shift in the low temperature state.

  However, if the learning value of the shift in the low temperature state and the learning value of the shift in the normal state are individually learned in this way, for example, in the use state where the number of shifts in the normal state increases, the number of shifts in the low temperature state is small However, there is a problem that the shift quality of the shift in the low temperature state is not easily improved.

  Therefore, the present invention separately learns the learning value of the shift in the low temperature state and the learning value of the shift in the normal temperature state, even if the vehicle travels only in the normal temperature state or only in the low temperature state. An object of the present invention is to provide a shift control device for an automatic transmission that can improve the shift quality in shifting in the other state.

The present invention according to claim 1 (see, for example, FIG. 1 to FIG. 7) is based on the shift state detecting means (22) for detecting the shift state at the time of shifting and the detection result of the shift state detecting means (22). Learning values (P _S2 A, P _TA A, P _S2 B, P _TA ) for correcting the hydraulic pressure command value (P _B4 ) supplied to the hydraulic servo of the frictional engagement element (for example, B-4) in the shift control of B, P _S2 C, P _TA C, P _S2 B ′, P _TA B ′, P _S2 C ′, P _TA C ′) and learning control means (26) for performing learning by calculating and recording, and the learning A shift control device (1) of an automatic transmission (20), comprising: a shift control means (21) that performs hydraulic control of a hydraulic servo of a friction engagement element (for example, B-4) based on a learning result by the control means (26). )
Oil temperature detecting means (31) for detecting the oil temperature;
Based on the oil temperature detected by the oil temperature detection means (31), an oil temperature state determination means (24) for determining a shift in a normal temperature state (Normal) and a shift in a low temperature state (Cold-Mid, Cold-High). ) And
The learning control means (26)
Based on the determination result by the oil temperature state determination means (24), the shift to the low temperature (Cold-Mid, Cold-High ) of the normal temperature (Normal) each normal-temperature learned value by the shift of the _(P S2 A, Individual learning means (28) for individually learning the learning value for P _TA A) and the first low temperature learning value (P _S2 B, P _TA B, P _S2 C, P _TAC );
The individual learning the normal-temperature learned value is learned by the means _{(28) (P S2 A,} P TA A) and the first low-temperature learned value _{(P S2 B, P TA B} , P S2 C, P TA C) Learning reflecting means (29) for reflecting one of the learning results of the second learning value to the other learning value,
The present invention resides in a shift control device (1) for an automatic transmission.

According to a second aspect of the present invention (see, for example, FIGS. 1 to 7), the learning control means (26) performs the shift at the normal temperature state (Normal) determined by the oil temperature state determination means (24). Initial learning completion determination means (25) for determining completion of initial learning when the learning progress state is equal to or greater than a predetermined progress state;
The individual learning means (28) is based on the result of determination by the oil temperature state determination means (24) until the initial learning completion is determined by the initial learning completion determination means (25). (P _S2 A, P _TA A) and the first low-temperature learning value (P _S2 B, P _TA B, P _S2 C, P _TA C), respectively,
After the initial learning completion is determined by the initial learning completion determining means (25), the learning control means (26) is based on the determination result by the oil temperature state determining means (24), and the normal temperature state (Normal in shifting), the ambient temperature learning value _(P S2 _a, continued learning _{P TA} a), and the low temperature (cold-Mid, in the shift of cold-High), the ambient temperature learning value _{(P S2} A room temperature base learning means (27) for learning second low temperature learning values (P _S2 B ′, P _TA B ′, P _S2 C ′, P _TAC ′) set based on A, P _TA A) Have
The shift control apparatus (1) for an automatic transmission according to claim 1, wherein

According to a third aspect of the present invention (see, for example, FIGS. 1 to 7), the learning reflecting means (29) is configured to learn the normal temperature learning values (P _S2 A, P _TA ) learned by the individual learning means (28). A) and the learning result of the first low-temperature learning value ( _PS2B , _PTAB , _PS2C , _PTAC ) are reflected in the other learning value, and the learning value of the other The learning result is not reflected on the one learning value.
The shift control device (1) for an automatic transmission according to claim 1 or 2, characterized in that

In the present invention according to claim 4 (see, for example, FIGS. 3, 4, and 6), the learning reflection means (29) uses the learning result of the learning value for normal temperature (P _S2 A, P _TA A) as the learning result. Reflected in the first low temperature learning value (P _S2 B, P _TA B, P _S2 C, P _TAC ),
A shift control apparatus (1) for an automatic transmission according to claim 3, wherein

In the present invention according to claim 5 (see, for example, FIG. 6), the learning reflection means (29) is configured such that the learning value for normal temperature (P _S2 A, P _TA A) before learning is the learning value for the first low temperature ( When it is larger than P _S2 B, P _TA B, P _S2 C, and P _TA C), the amount of change (P _S2 ΔA) between the learning value for normal temperature (P _S2 A, P _TA A) before and after learning , P _TA ΔA) is reflected on the first low temperature learning value (P _S2 B, P _TA B, P _S2 C, P _TA C),
The shift control device (1) for an automatic transmission according to claim 4, wherein the shift control device (1) is an automatic transmission.

In the present invention according to claim 6 (see, for example, FIG. 6), the learning reflection means (29) is configured such that the learning value for normal temperature (P _S2 A, P _TA A) before learning is the learning value for the first low temperature ( P _S2 B, P _TA B, P _S2 C, P _TA C) and the learning value for normal temperature (P _S2 A, P _TA A) after learning is the first low temperature learning value (P _S2 B). , P _TA B, P _S2 C, P _TA C), the learning value for normal temperature (P _S2 A, P _TA A) after learning is the learning value for the first low temperature (P _S2 B, P _TA B, P _S2 C, P _TAC )
The shift control device (1) for an automatic transmission according to claim 4 or 5, characterized in that

The present invention according to claim 7 (see, for example, FIG. 6) includes the normal temperature learning values ( _PS2A , _PTAA ) and the first low temperature learning values ( _PS2B , _PTAB , _PS2C , _PTAC ) has positive and negative values,
In the learning reflecting means (29), the learning value for normal temperature (P _S2 A, P _TA A) after learning is the learning value for the first low temperature (P _S2 B, P _TA B, P _S2 C, P _TA C). ) And the learning value for normal temperature (P _S2 A, P _TA A) after learning is the learning value for the first low temperature (P _S2 B, P _TA B, P _S2 C, P _TA C). ), The amount of change (P _S2 ΔA, P _TA ΔA) between the learning value for normal temperature (P _S2 A, P _TA A) before and after learning is calculated as the first low-temperature learning value (P _S2 A, P _TA A). _S2 B, P _TA B, P _S2 C, P _TAC )
The shift control device for an automatic transmission according to any one of claims 4 to 6, wherein:

The present invention according to claim 8 (see, for example, FIG. 5), the individual learning means (28), the normal temperature for the learning value _{(P S2 A, P TA A} ) fixes the limit width (± q, ± t) from And the correction limit width (± r, ± u, ± s, ± v) of the first low temperature learning value (P _S2 B, P _TA B, P _S2 C, P _TAC ) is set small, and The learning value for normal temperature (P _S2 A, P _TA A) is the correction limit width (± r, ± u,) of the first low-temperature learning value (P _S2 B, P _TA B, P _S2 C, P _TAC ). When it becomes larger than ± s, ± v), the correction limit width (± r, ± u, ±) of the first learning value for low temperature (P _S2 B, _PTAB , _PS2 C, _PTAC ) s, ± v) is reset to the increased learning value for normal temperature (P _S2 A, P _TA A),
A shift control apparatus (1) for an automatic transmission according to any one of claims 4 to 7.

The present invention according to claim 9 (see, for example, FIG. 1, FIG. 3, and FIG. 7) includes an input shaft rotational speed sensor (32) for detecting the rotational speed of the input shaft (3),
The shift state detection means (22) detects the shift state based on a change in the rotational speed of the input shaft (3) during a shift.
The shift control device (1) for an automatic transmission according to any one of claims 1 to 8, characterized in that:

The present invention according to claim 10 (see, for example, FIG. 3 and FIG. 7) includes a gear timing means (23) for timing the time passage in the gear shift,
The shift state detecting means (22) detects the shift state based on a time measurement result of the shift time measuring means (23).
A shift control apparatus (1) for an automatic transmission according to any one of claims 1 to 9.

In the present invention according to claim 11 (see, for example, FIGS. 3 to 7), the learning value for correcting the hydraulic pressure command value (P _B4 ) learned by the learning control means (26) is the friction engagement element. (B-4) is a learning value ( _PS2A , _PS2B , _PS2C , _PS2B ', _PS2C ') with respect to the standby pressure ( _PS2 ) before engaging.
The shift control device (1) for an automatic transmission according to any one of claims 1 to 10, characterized in that:

According to the twelfth aspect of the present invention (see, for example, FIGS. 3 to 7), the learning value for correcting the hydraulic pressure command value (P _B4 ) learned by the learning control means (26) is the friction engagement element. (B-4) is a learning value (P _TA A, P _TA B, P _TA C, P _TA B ′, P _TA C ′) with respect to the engagement start pressure (P _TA ) for starting the engagement.
The shift control device (1) for an automatic transmission according to any one of claims 1 to 10, characterized in that:

In the present invention according to claim 13 (see, for example, FIGS. 1 and 2), the friction engagement element (B-4) includes a band brake.
The shift control device (1) for an automatic transmission according to claim 12, wherein the shift control device (1) is an automatic transmission.

In the present invention according to claim 14 (see, for example, FIG. 7), the shift is a power-on upshift.
A shift control apparatus (1) for an automatic transmission according to any one of claims 1 to 13, characterized in that:

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, the individual learning unit obtains the normal temperature learning value and the first low temperature learning value for the normal temperature shift and the low temperature shift based on the determination result by the oil temperature state determination unit, respectively. Since learning is performed individually, even if the vehicle is traveling only in a low temperature state, it is possible to improve the shift quality in the shift in the low temperature state, but the learning reflection means is a normal temperature that is learned by the individual learning means. One of the learning results of the learning value for the first temperature and the learning value for the first low temperature is reflected in the other learning value, so even if the vehicle is running only in the normal temperature state or only in the low temperature state, one of the learning results Based on the learning result of the value, it is possible to perform highly reliable shift control at both a normal temperature and a low temperature shift.

  According to the second aspect of the present invention, the individual learning means performs the individual learning of the normal temperature learning value and the first low temperature learning value until the initial learning completion determining means determines the initial learning completion, and the normal learning base After the learning device determines that the initial learning is completed by the initial learning completion determination device, the learning device continues to learn the learning value for the normal temperature at the normal temperature shift, and sets the learning value for the normal temperature as the base at the low temperature shift. Since the learning value for the second low temperature is learned, even before the completion of the initial learning is judged, the shift quality in the normal temperature shift and the low temperature shift can be improved by reflecting the learning reflecting means. After the initial learning is completed, it is possible to perform highly reliable shift control based on a highly reliable learning value for normal temperature at both normal temperature and low temperature shifts.

  According to the third aspect of the present invention, the learning reflecting means reflects one of the learning results of the normal temperature learning value and the first low temperature learning value in the other learning value, and the learning result of the other learning value. Is not reflected in one learning value, so that one of the more reliable learning results can be reflected in the other learning value, and the other learning result lacking in reliability can be reflected in one of the highly reliable learning results. It can be prevented from reflecting.

  According to the fourth aspect of the present invention, the learning reflecting means reflects the learning result of the normal temperature learning value in the first low temperature learning value, so that the highly reliable learning value of the normal temperature learning value is used for the first low temperature. The learning value can be reflected, and it is possible to perform highly reliable shift control by shifting in a low temperature state.

  According to the fifth aspect of the present invention, when the learning reflection value before learning is larger than the first learning value for low temperature, the learning reflection means changes the amount of learning before and after learning in the learning value for normal temperature. Is reflected in the first low-temperature learning value, so that the learning result of the highly reliable normal-temperature learning value can be obtained without significantly changing the first low-temperature learning value individually learned by the individual learning means. This can be reflected in the learning value for low temperature, and it is possible to perform highly reliable shift control by shifting in a low temperature state.

  According to the sixth aspect of the present invention, the learning reflecting means has the learning value for normal temperature before learning smaller than the first learning value for low temperature, and the learning value for normal temperature after learning is less than the first learning value for low temperature. When the value is large, the learning value for normal temperature after learning is reflected in the learning value for the first low temperature, so that the reliability of the reliability can be improved without significantly changing the learning value for the first low temperature individually learned by the individual learning means. The learning result of the high learning value for normal temperature can be reflected in the first learning value for low temperature, and it is possible to perform highly reliable shift control by shifting in the low temperature state.

  According to the seventh aspect of the present invention, the learning reflecting means has a learning value for normal temperature after learning that is positive and negative with respect to the learning value for low temperature, and the learning value for normal temperature after learning is learning for the first low temperature. Since the amount of change in the learning value for normal temperature before and after learning is reflected in the first learning value for low temperature when moving away from the value, the first learning value for low temperature learned individually by the individual learning means The learning result of the highly reliable learning value for normal temperature can be reflected in the first learning value for low temperature without drastically changing the value, and it is possible to perform highly reliable shift control by shifting in a low temperature state. can do.

  According to the eighth aspect of the present invention, since the individual learning means sets the correction limit width of the first low temperature learning value smaller than the correction limit width of the normal temperature learning value, the low learning state with low reliability is set. While it is possible to prevent the learning value for the first low temperature from becoming a significantly incorrect value due to learning at the shift, the learning value for the normal temperature is larger than the correction limit width of the learning value for the first low temperature. When this happens, the correction range of the first low-temperature learning value is reset to the increased normal learning value, so that the learning result of the normal-temperature learning value must be reflected in the first low-temperature learning value. Can do.

  According to the ninth aspect of the present invention, since the shift state detecting means detects the shift state based on a change in the rotational speed of the input shaft at the time of shifting, the learning control means detects engine blow, tie-up, shift shock, etc. The learning value can be learned on the basis of the shift state considered.

  According to the tenth aspect of the present invention, since the shift state detecting means detects the shift state based on the time measurement result of the shift time measuring means, the learning control means is based on the shift state considering various time passages in the shift, Learning value can be learned.

  According to the eleventh aspect of the present invention, the learning value for correcting the hydraulic pressure command value learned by the learning control means is the learning value for the standby pressure before the engagement of the friction engagement elements. Engagement) Learning can be performed to prevent shock, shift time delay, and the like.

  According to the twelfth aspect of the present invention, the learning value for correcting the hydraulic pressure command value learned by the learning control means is the learning value for the engagement start pressure for starting the engagement of the friction engagement element. You can learn to prevent blowing and tie-up.

  According to the thirteenth aspect of the present invention, since the friction engagement element is composed of a band brake, if the learning of the engagement start pressure is not sufficient, an engagement shock caused by the engagement of the brake band is likely to occur. According to the learning result of the learning value, it is possible to perform highly reliable gear shifting control at both the normal temperature and low temperature gear shifting, so that the occurrence of engagement shock can be prevented.

  According to the fourteenth aspect of the present invention, since the speed change is a power-on upshift, the hydraulic control of the frictional engagement element on the engagement side can be performed with high accuracy in the change-over shift of the frictional engagement element. .

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. First, an automatic transmission 20 to which the present invention can be applied will be described with reference to FIGS. 1 and 2.

  For example, an automatic transmission 20 suitable for use in an FF (front engine, front drive) type vehicle includes a torque converter 4, a 3-speed main transmission mechanism 2, a 3-speed auxiliary transmission mechanism 5, and a differential (see FIG. 1). (Not shown), and these components are housed in a case that is integrally joined together. The torque converter 4 is provided with a lock-up clutch 4a, and the input shaft 3 of the main transmission mechanism 2 from the engine crankshaft 13 through an oil flow in the torque converter or through a mechanical connection by the lock-up clutch. To enter. The integral case supports the input shaft 3 arranged in alignment with the crankshaft and the counter shaft 6 and the differential left and right output shafts in parallel with the input shaft 3, and is rotatably supported by the outside of the case. A hydraulic control device 30 which will be described later is disposed.

  The main speed change mechanism 2 has a planetary gear unit 15 including a simple planetary gear 7 and a double pinion planetary gear 9. The simple planetary gear 7 includes sun gears S1, S2, a ring gear R1, and a pinion P1 including a long pinion that meshes with these gears. The double pinion planetary gear 9 is composed of a supported carrier CR, and supports the sun gear S2, the ring gear R2, and the pinion P1 meshing with the sun gear S2 and meshing with the pinion P1 and the ring gear R2 that mesh with each other. Common carrier CR.

  The input shaft 3 linked from the engine crankshaft 13 via the torque converter 4 can be connected to the ring gear R1 of the simple planetary gear 7 via the first (forward) clutch C-1, and the second It can be connected to the sun gear S1 of the simple planetary gear 7 via the (direct) clutch C-2. The sun gear S2 of the double pinion planetary gear 9 can be directly locked by the first brake B-1 and can be locked by the second brake B-2 via the first one-way clutch F-1. Further, the ring gear R2 of the double pinion planetary gear 9 can be locked by the third brake B-3 and the second one-way clutch F-2. The common carrier CR is connected to a counter drive gear 8 that is an output member of the main transmission mechanism 2.

  On the other hand, in the auxiliary transmission mechanism (unit) 5, the output gear 16, the first simple planetary gear 10, and the second simple planetary gear 11 are arranged in this order in the axial direction of the counter shaft 6 constituting the second shaft toward the rear side. The counter shaft 6 is rotatably supported on the integral case side through a bearing. The first and second simple planetary gears 10 and 11 are of the Simpson type.

  The first simple planetary gear 10 is connected to a counter driven gear 17 whose ring gear R3 meshes with the counter drive gear 8, and the sun gear S3 is connected to a sleeve shaft 12 rotatably supported by the counter shaft 6. It is fixed. The pinion P3 is supported by a carrier CR3 having a flange integrally connected to the counter shaft 6, and the carrier CR3 supporting the other end of the pinion P3 is connected to the inner hub of the UD direct clutch C-3. Yes. The second simple planetary gear 11 has a sun gear S4 formed on the sleeve shaft 12 and connected to the sun gear S3 of the first simple planetary gear. The ring gear R4 is connected to the counter shaft 6. .

  The UD direct clutch C-3 is interposed between the carrier CR3 of the first simple planetary gear and the connecting sun gears S3 and S4, and the connecting sun gears S3 and S4 are fourth brake band brakes. The brake B-4 (friction engagement element) can be used. Further, the carrier CR4 that supports the pinion P4 of the second simple planetary gear can be locked by the fifth brake B-5.

  Next, the operation of the automatic transmission will be described with reference to FIGS.

  In the first speed (1ST) state in the D (drive) range, the forward clutch C-1 is engaged, and the fifth brake B-5 and the second one-way clutch F-2 are engaged, and the double pinion planetary gear is engaged. The ring gear R2 and the carrier CR4 of the second simple planetary gear 11 are held in a stopped state. In this state, the rotation of the input shaft 3 is transmitted to the ring gear R1 of the simple planetary gear via the forward clutch C-1, and the ring gear R2 of the double pinion planetary gear is in the stopped state, so that the sun gears S1 and S2 are moved in the reverse direction. The common carrier CR is greatly decelerated and rotated in the forward direction while idling. That is, the main transmission mechanism 2 is in the first speed state, and the reduced rotation is transmitted to the ring gear R3 of the first simple planetary gear in the auxiliary transmission mechanism 5 via the counter gears 8 and 17. The sub-transmission mechanism 5 is in the first speed state when the carrier CR4 of the second simple planetary gear is stopped by the fifth brake B-5, and the decelerated rotation of the main transmission mechanism 2 is further performed by the sub-transmission mechanism 5. Decelerated and output from the output gear 16.

  In the second speed (2ND) state, in addition to the forward clutch C-1, the second brake B-2 is operated (engaged), and further, the second one-way clutch F-2 to the first one-way clutch F- The operation is switched to 1, and the fifth brake B-5 is maintained in the locked state. In this state, the sun gear S2 is stopped by the second brake B-2 and the first one-way clutch F-1, and therefore the rotation of the ring gear R1 of the simple planetary gear transmitted from the input shaft 3 via the forward clutch C-1. Rotates the carrier CR in the forward direction while rotating the ring gear R2 of the double pinion planetary gear in the forward direction. Further, the reduced speed rotation is transmitted to the auxiliary transmission mechanism 5 via the counter gears 8 and 17. That is, the main transmission mechanism 2 is in the second speed state, and the sub transmission mechanism 5 is in the first speed state by the engagement of the fifth brake B-5, and the second speed state and the first speed state are combined to automatically shift. The second speed is obtained by the entire machine 20.

  In the third speed (3RD) state, the forward clutch C-1, the second brake B-2, and the first one-way clutch F-1 are held in the engaged state as they are, and the fifth brake B-5 is locked. It is released and the fourth brake B-4 is engaged. That is, the main transmission mechanism 2 is maintained as it is, and the rotation at the second speed described above is transmitted to the auxiliary transmission mechanism 5 via the counter gears 8 and 17, and the auxiliary transmission mechanism 5 has the first simple structure. The rotation from the ring gear R3 of the planetary gear is output from the carrier CR3 as the second speed rotation by fixing the sun gear S3. Therefore, the second speed of the main transmission mechanism 2 and the second speed of the auxiliary transmission mechanism 5 are the third speed in the entire automatic transmission 20. Is obtained.

  In the 4th speed (4TH) state, the main speed change mechanism 2 is the same as the 2nd speed and 3rd speed states in which the forward clutch C-1, the second brake B-2, and the first one-way clutch F-1 are engaged. Yes, the subtransmission mechanism 5 releases the fourth brake B-4 and engages the UD direct clutch C-3. In this state, the carrier CR3 of the first simple planetary gear and the sun gears S3 and S4 are connected to each other so that the planetary gears 10 and 11 are directly connected to rotate integrally. Accordingly, the second speed of the main transmission mechanism 2 and the direct connection (third speed) of the auxiliary transmission mechanism 5 are combined, and the automatic transmission 20 as a whole outputs the fourth speed rotation from the output gear 16.

  In the fifth speed (5TH) state, the forward clutch C-1 and the direct clutch C-2 are engaged, and the rotation of the input shaft 3 is transmitted to the ring gear R1 and the sun gear S of the simple planetary gear. In this case, the gear unit is directly connected to rotate integrally. Further, the subtransmission mechanism 5 is directly coupled with the UD direct clutch C-3 engaged, and therefore the third speed (direct coupling) of the main transmission mechanism 2 and the third speed (direct coupling) of the subtransmission mechanism 5 are combined. Thus, the fifth transmission is output from the output gear 16 throughout the automatic transmission 20.

  In FIG. 2, the parenthesized circles indicate the coasting engine brake operating state (4, 3 or 2 range). That is, at the first speed, the third brake B-3 is operated to prevent the ring gear R2 from rotating due to the overrun of the second one-way clutch F-2. In the second speed, the third speed, and the fourth speed, the first brake B-1 is operated to prevent the sun gear S1 from rotating due to the overrun of the first one-way clutch F-1. The black circle is engaged with the brake B-2 but does not carry torque when the one-way clutch F-1 rotates freely.

  In the R (reverse) range, the direct clutch C-2 and the third brake B-3 are engaged, and the fifth brake B-5 is engaged. In this state, the rotation of the input shaft 3 is transmitted to the sun gear S1 via the direct clutch C-2, and the ring gear R2 of the double pinion planetary gear is stopped by the third brake B-3. The carrier CR is also reversely rotated while the R1 is idling in the reverse direction, and the reverse rotation is transmitted to the auxiliary transmission mechanism 5 via the counter gears 8 and 17. In the auxiliary transmission mechanism 5, the carrier CR4 of the second simple planetary gear is also stopped in the reverse rotation direction based on the fifth brake B5, and is maintained in the first speed state. Therefore, the reverse rotation of the main transmission mechanism 2 and the first speed rotation of the auxiliary transmission mechanism 5 are combined, and the reverse rotation speed reduction rotation is output from the output shaft 16.

  Next, the shift control device 1 of the automatic transmission will be described with reference to FIGS.

  As shown in FIG. 3, the control unit (ECU) U is composed of, for example, a microcomputer including a nonvolatile memory (not shown), and detects an oil temperature of oil (ATF) in the hydraulic control device 30. A sensor 31, an input shaft speed sensor 32 for detecting the speed of the input shaft 3, an accelerator opening sensor 33 for detecting the accelerator pedal depression amount of the driver, and an output speed of an engine (E / G) not shown. An E / G rotational speed sensor 34 to detect and a vehicle speed sensor 35 to detect the rotational speed of the output shaft 16 and detect the vehicle speed are connected to each other, and signals from these sensors are inputted. Further, the control unit U includes a shift control means 21, a shift state detection means 22, a transmission time measuring means 23, an oil temperature state determination means 24, an initial learning completion determination means 25, and a learning control means 26, and further includes the learning control. The means 26 includes a normal temperature base learning means 27, an individual learning means 28, and a learning reflection means 29.

  Since the shift control means 21 electronically controls solenoid valves (including linear solenoid valves) of the hydraulic control device 30, the shift control means 21 is configured to be able to output hydraulic pressure command values to be supplied to the hydraulic servos of the clutches and brakes described above. When a shift determination is made based on the vehicle speed V detected by the vehicle speed sensor 35 and the accelerator opening θd detected by the accelerator opening sensor 33, a hydraulic pressure command value described later is calculated in detail, and later described. The learning result of the learning control means 26 is added to the hydraulic pressure command value, and the shift control is performed by controlling the engagement state of each clutch and each brake. The timing at which the hydraulic pressure command value is output is controlled based on the time measurement time measured by a transmission time measuring means 23 described later.

  The transmission timing unit 23 is configured to perform timing of each timer, which will be described later in detail, when the shift determination is made by the transmission control unit 21, and these timing results are used as the transmission control unit 21 and the shift state detection. Output to means 22.

The shift state detection means 22 is configured to detect the input shaft rotation speed N _IN detected by the input shaft rotation speed sensor 32 and the actual shift start time measured by the shift timing means 23 during the shift controlled by the shift control means 21. Based on the time until the end (that is, the inertia phase time), the shift state is detected, and the state is output to the learning control means 26 described later in detail.

  Based on the oil temperature detected by the oil temperature sensor 31, the oil temperature state determination unit 24 determines which temperature state the shift controlled by the shift control unit 21 is, and determines to the learning control unit 26. Output the result. In the present embodiment, as shown in FIG. 5, “lowest low temperature Cold-Low1” is greater than or equal to threshold Temp1 and less than threshold Temp2, and “low and low temperature” is greater than or equal to threshold Temp2 and less than threshold Temp3. "Cold-Low2", when it is not less than the threshold Temp3 and less than the threshold Temp4, "mid-low temperature Cold-Mid", and when it is not less than the threshold Temp4 and less than the threshold Temp5, it is "high / low temperature Cold-High", threshold Temp5 When it is above and below the threshold Temp6, it is determined as “normal temperature state Normal”, and when it is above the threshold Temp6, it is determined as “high temperature state Hot”.

  In this embodiment, due to variations in the viscosity of the oil, the learning results in the shift in the high temperature state Hot, the shift in the low / low temperature state Cold-Low 2 and the shift in the minimum low temperature state Cold-Low 1 are not reliable. Therefore, when these three states are determined, the learning control by the learning control means 26 is not performed, and the learning results of the normal temperature state Normal, the high / low temperature state Cold-High, and the intermediate / low temperature state Cold-Mid are described in detail later. Is used to issue a hydraulic command for hydraulic control. That is, in the present embodiment, learning of shifting at a normal temperature state refers to learning at the time of shifting in a normal temperature state Normal, and learning of shifting at a low temperature state refers to a high-low temperature state Cold-High and a low-temperature state Cold-Mid. It means learning at the time of shifting.

As shown in FIG. 3, the initial learning completion determination unit 25 has a learning progress state of the normal temperature learning values P _S2 A and P _TA A determined by the individual learning unit 28 of the learning control unit 26 described later in detail. In this case, the initial learning is completed when there is no change in the learning of the normal temperature learning values P _S2 A and P _TA A by the individual learning means 28 in the normal state normal speed shifting continuously for a predetermined number of times. Determine.

  The learning control unit 26 calculates and records a learning value for correcting the command value of the hydraulic pressure supplied to the hydraulic servo of each clutch or each brake in the next shift control based on the detection result of the shift state detecting unit 22. Thus, learning is performed, and this learning is calculated and recorded for each hydraulic pressure command value supplied to the hydraulic servo of each clutch or each brake. In the present embodiment, the 2-3 upshift at power-on will be described as an example, and other shifts or learning of the hydraulic pressure command values of the friction engagement elements are substantially the same. The description is omitted.

The normal temperature base learning means 27 is for normal temperature learning in the normal temperature state normal shift determined by the oil temperature state determination means 24 after the initial learning completion determination means 25 determines completion of the initial learning. In the shift of the high and low temperature state Cold-High discriminated by the oil temperature state discriminating means 24, the learning of the normal temperature learning values P _S2 A and P _TA A is corrected. 2 Learning of low-temperature learning values P _S2 B ′, P _TA B ′ is performed, and further, in the middle-low temperature Cold-Mid shift determined by the oil temperature state determination means 24, the learning value P for normal temperature is used. Learning of the second low-temperature learning values P _S2 C ′ and P _TA C ′ for correcting _S2 A and P _TA A is performed.

The individual learning means 28 performs the normal temperature state normal shift and the high / low temperature state Cold-High shift determined by the oil temperature state determination means 24 until the initial learning completion determination means 25 determines the completion of the initial learning. With the medium-low temperature Cold-Mid shift, the normal temperature learning values P _S2 A and P _TA A, the first low temperature learning values P _S2 B and P _TA B, and the first low temperature learning values P _S2 C and P _{TA, respectively.} Learn C individually.

The learning reflection means 29 uses the normal temperature learning values P _S2 A and P _TA A learned by the individual learning means 28 as the first low temperature learning values P _S2 B and P _TA B and the first low temperature learning value P. _{S2 C,} performs arithmetic processing to reflect the _{P TA} C. In the present embodiment, the learning result of the high / low temperature state Cold-High shift and the middle / low temperature state Cold-Mid shift is the result of learning the normal temperature state normal shift due to the increase in oil viscosity. Therefore, the first low-temperature learning values P _S2 B and P _TA B and the first low-temperature learning values P _S2 C and P _TAC are used as the normal temperature learning values P _S2 A and P _TA A, respectively. The calculation processing to reflect is not performed, but of course, the calculation processing to reflect each other may be performed.

  Next, the hydraulic control (hydraulic command value) by the shift control means 21 will be described with reference to the time chart of FIG. 7 taking 2-3 upshift as an example.

First, when the shift control means 21 determines a 2-3 upshift shift based on signals from the accelerator opening sensor 33 and the vehicle speed sensor 35 (time t1), the time measurement by the transmission time measuring means 23 is started. The hydraulic pressure command value P _B4 (hereinafter referred to as “engagement hydraulic pressure”) to the hydraulic servo of the engagement-side fourth brake B-4 (see FIG. 2) is set to a predetermined pressure _PS1 . Further, the hydraulic pressure control device is configured so that the hydraulic pressure P _B5 (hereinafter referred to as “release hydraulic pressure”) to the hydraulic servo of the fifth brake B-5 on the release side becomes a high hydraulic pressure _PW including the engagement pressure. A signal is output to a solenoid valve (not shown) 30 (time t2). The supply of the high hydraulic pressure _PW is maintained until the engagement-side hydraulic pressure P _B4 starts the first sweep-up ( _tSE, time point t5).

On the other hand, the predetermined pressure P _S1 is set to hydraulic pressure required to fill the hydraulic pressure chamber of the hydraulic servo, is the predetermined time t _SA holds. When the predetermined time t _SA elapses (time point t3), the engagement side hydraulic pressure P _B4 is swept down at a predetermined gradient [(P _S1 −P _S2 ) / t _SB ], and the engagement side hydraulic pressure P _B4 is changed to the standby pressure P. _{At S2} (time t4), the sweep down is stopped and held at the standby pressure _PS2 .

該待machine pressure _{P S2} is more information learned learning value by the learning control means 26 to be described later (the normal-temperature learned value _{P S2} A, first low-temperature learned value _{P S2} B, for the first low-temperature learned value _P S2 C, or room temperature for learning value P _{S2 a} and the second low-temperature learned value P _{S2 B} obtained by adding the 'cold learning value P _{S2 a} and the second low-temperature learned value P _{S2 C'),} i.e. in the learned hydraulic pressure value Thus, the pressure is learned so that the pressure is not less than the piston stroke pressure and does not cause the rotational change of the input shaft.該待machine pressure _{P S2} is maintained until a predetermined time _{t SE} elapsed (time point t5).

During this time, as the release side control, the release side torque T _B5 ′ is calculated by the function [T _B5 ′ = f _TB5 (P _B4 , T _T )] of the engagement side hydraulic pressure P _B4 and the input torque T _T , and the margin rate S _1U and S _2U are considered (T _B5 = S _1U × T _B5 ′ + S _2U ), and the release side torque T _B5 is calculated. Then, the release side hydraulic pressure P _B5 is calculated from the release side torque T _B5 [P _B5 = f _PB5 (T _B5 )]. That is, first, the torque T _B4 shared by the engagement side frictional engagement element is calculated by [T _B4 = A _B4 + P _B4 + B _B4 ] (A _B4 ; effective radius × piston = area × number × friction coefficient, B _B4 ; piston stroke pressure), and further, the torque T _B5 ′ shared by the disengagement side frictional engagement element is calculated by [T _B5 ′ = (1 / b) T _T − (a / b) T _B4 ]. Is done. Note that, b is the torque sharing the disengagement side, a is the torque sharing engagement side, the T _T is the input shaft torque. Then, the margin ratios (tie-up degrees) S _1U and S _2U are used to set the tie-up degree with the engagement side frictional engagement element in consideration of drive feeling, and the release side torque T _B5 is set to [T _B5 = _S1U × _TB5 ′ + _S2U ]. The margin rates S _1U and S _2U are arbitrarily set so as to match the driver's feeling in a large number of throttle opening / vehicle speed maps (not shown) selected according to the difference in oil temperature. In general, S _1U > 1.0 and S _2U > 0.0. Further, the release side hydraulic pressure P _B5 is calculated from [P _B5 = (T _B5 / A _B5 ) + B _B5 ] from the release side torque T _B5 considering the margin ratio (A _B5 ; release side friction engagement). Effective radius of element × piston area × number of sheets × friction coefficient, B _B5 ; release-side piston stroke pressure).

Since the sweep-down by the release side hydraulic pressure P _B5 calculated as described above depends on the engagement side hydraulic pressure P _B4 , at the start of the inertia phase (t _TA ) at which the input shaft rotation speed starts to change. It consists of two steps of bending, that is, a relatively steep sweep-down corresponding to the first sweep-up on the engagement side, and a relatively gentle-gradient sweep-down corresponding to the second sweep-up on the engagement side. .

Then, the sweep-down is details like the engaging side to be described later, the input shaft rotational speed change amount .DELTA.N, continues until a predetermined rotation change start determining rotational speed dN _S (time t8). Next, a change δP _{E in the} release hydraulic pressure is set, and sweeps down with a gradient due to the change in the hydraulic pressure. The sweep down continues until the release side hydraulic pressure P _B5 becomes 0, thereby completing the release side hydraulic control. .

On the other hand, as the control on the engagement side, the input rotation speed is based on a predetermined function [P _TA = f _PTA (T _T )] that changes according to the input torque T _T input from the engine via the torque converter 4. calculating the engagement starting pressure P _TA immediately before (immediately before the inertia phase) the rotation change of the N _iN is started. Engagement starting pressure _{P TA} immediately before the time of the inertia phase starts, first input torque _{T T} engagement side torque allotment torque to _{T B4 (= 1 / a ·} T T; a: torque sharing rate) is calculated, further P _TA = (T _B4 / A _B4 ) + B _B4 + dP _TA [B _B4 ; piston stroke pressure (= spring load), A _B4 ; friction plate effective radius × piston area × number of friction plates × friction coefficient, dP _TA ; oil pressure delay The target engagement start pressure _PTA is calculated from the hydraulic pressure of minutes].

Further, here, the calculated target engagement start hydraulic pressure _PTA includes learning values (learning value P _TA A for normal temperature, first learning value P _TA B for first temperature, The first low temperature learning value P _TA C, the normal temperature learning value P _TA A, the second low temperature learning value P _TA B ′, the normal temperature learning value P _TA A, and the second low temperature learning value P _TA C ′) The final target engagement start pressure _PTA is calculated by addition.

Then, based on the engagement starting pressure _{P TA} that was calculated inertia phase start immediately before according to the input torque _{T T,} the predetermined gradient is calculated by a preset predetermined time _{t TA [(P TA -P S2} ) / T _TA ], the engagement side hydraulic pressure sweeps up based on the gradient (time t5 to t7). Due to the first sweep-up having a relatively gentle gradient, the engagement torque increases, and the hydraulic pressure rises to the state just before the input rotational speed change starts, that is, to the calculated predetermined target engagement start pressure _PTA. To do. This state is a state before the upshift, and becomes a torque phase in which the output shaft torque drops temporarily.

The input torque T _T (= turbine torque) is determined based on the vehicle running condition, and the engine torque is obtained by linear interpolation based on the throttle opening and the engine speed using a map (not shown). The speed ratio is calculated from the speed ratio, the torque ratio is obtained from the map based on the speed ratio, and the engine torque is multiplied by the torque ratio.

When reaching the target engagement starting pressure P _TA, i.e. at time t7 that is predicted to have entered the inertia phase rotation change of the input shaft rotational speed is started, the hydraulic change [delta] P _TA is the input shaft rotational speed N It is calculated by a function [δP _TA = fδ _PTA (ωa ′)] corresponding to a target target rotation change rate (dωa / dt; expressed as ωa ′) at the start of _IN rotation change. That is, assuming that k is a constant, t _aim is a target shift start time, ωa ′ is a target rotational change rate [ωa; gradient to target rotational speed], and I is an inertia amount, the hydraulic pressure change δP _TA = [I · ωa]. / [K · t _aim ]. Then, it is swept up with a gradient by the oil pressure change δP _TA (time t7 to t8). Sweep-up of the second is continued until the rotation variation ΔN from the input shaft rotational speed N _TS during rotation change start reaches a predetermined shift start judgment rotation speed dN _S (time t8).

Next, when the rotation change ΔN reaches the predetermined shift start determination rotation speed dN _S , the engagement side hydraulic pressure P _B4 takes into account the amount of acceleration of the brake band of the fourth brake B-4 that is a band brake, The predetermined oil pressure _PDW is lowered (time point t8). Then, the engagement hydraulic pressure change [delta] P _I is set is feedback-controlled by the rotation speed of the change amount ΔN based on the detection of the input shaft speed sensor 5, is swept up by the slope of the [delta] P _I (point t8 ~ T9). The sweep-up by δP _I is continued up to α ₁ [%], for example, 70 [%] of the rotation change amount ΔN until the completion of the shift (S15). That is, _assuming that N _TS is the input shaft speed at the start of shifting, ΔN is the rotation change amount, g _i is the gear ratio before shifting, and g _{i + 1} is the gear ratio after shifting, [(ΔN × 100) / N _TS (g _i -G _{i + 1} )] reaches α ₁ [%].

Further, when α ₁ [%] of the rotation change amount is exceeded, a different oil pressure change δP _L is set by feedback control based on the smooth input shaft rotation speed change amount ΔN, and is swept up by the gradient of δP _L ( Time t9 to t10). The δP _L generally has a slightly gentler slope than δP _I , and the sweep-up is continued up to α ₂ [%], for example, 90 [%] of the amount of change in the rotational speed until the shift is completed. The [delta] P _I and [delta] P _L by sweep-up target shift time t _I is different according to the oil temperature more throttle opening-vehicle speed map (not shown) is selected and set based on the map.

When the target shift time t _I elapses, the shift end determination is made, the regimen at the time t _FE is set (time t10), the state is in state and substantially corresponds to the inertia phase has ended . Furthermore, a relatively sudden change in hydraulic pressure δP _FE is set, and the hydraulic pressure sweeps up rapidly due to the change in hydraulic pressure (time t10 to t11), and is set to a time sufficient to increase to the engagement pressure from time t10. When the predetermined time _tFE has elapsed, the hydraulic pressure control on the engagement side is completed, that is, the 2-3 upshift is completed.

  Next, learning control, which is a main part of the present invention, will be described with reference to a flowchart of learning control in FIG. 4, a table of learning values for each oil temperature state in FIG. 5, and an explanatory diagram of reflection patterns of learning values in FIG. 6. .

  As shown in FIG. 4, for example, when the 2-3 upshift as described above is completed (S1), first, it is determined whether or not the initial learning completion determination means 25 has determined whether or not the initial learning has been completed (S2). ). The determination of the completion of initial learning will be described in detail in step S9 described later.

Here, for example, when the vehicle is immediately after manufacture and the initial learning is not completed (No in S2), the process proceeds to step S6, where the detection result of the oil temperature sensor 31 and the oil temperature state determination means 24 Based on the determination result, it is determined which temperature state is indicated by the horizontal axis in the table of FIG. For example, when the oil temperature is between Temp4 and Temp5 and the discrimination result of the oil temperature state is the high / low temperature state Cold-High, the process proceeds to step S10, and the individual learning means 28 is operated by the above-described standby pressure _PS2 and The calculation of the first low-temperature learning values P _S2 B and P _TA B for the engagement start pressure P _TA is started.

In the calculation of the first low-temperature learning value P _S2 B for the standby pressure P _S2 , the shift state detected by the shift state detection means 22, that is, the input rotational speed detected by the input shaft rotational speed sensor 32. The time until the start of the change of N _IN is calculated by the time measuring means 23 measuring time. When the time elapsed until the start of the shift is longer than the best timing, the standby pressure P _S2 is insufficient and a delay occurs, so the first low temperature learning value P _S2 B increases with the time until the shift starts. If the time elapsed until the start of the shift is shorter than the best timing, the standby pressure _PS2 is too high and the start of the shift is too early, so the first low-temperature learning value _PS2B is shifted. Calculation is performed so as to decrease as time elapses until the start. The first low-temperature learning value P _S2 B has a correction limit width set to ± r, and is larger than the correction limit width ± s of the first low-temperature learning value P _S2 C, so The width is set to be smaller than the correction limit width ± q of the value P _S2 A (that is, q>r> s).

Further, in the calculation of the first low temperature learning value P _TA B with respect to the engagement start pressure P _TA , the shift state detected by the shift state detecting means 22, that is, the input shaft rotational speed sensor 32 is detected. The calculation is based on the detection of a situation where engine blow or tie-up has occurred due to a change in the input rotational speed N _IN . When engine blow occurs, the engagement start pressure _PTA is insufficient and the engagement of the fourth brake B-4 (load on the input shaft 3) is delayed. 1 When the tie-up is calculated to increase the learning value P _TA B for low temperature, the engagement start pressure P _TA is too high, and the engagement of the fourth brake B-4 (input shaft 3 The first low-temperature learning value _PTAB is reduced according to the tie-up amount. The first low temperature learning value P _TA B has a correction limit width set to ± u, and has a width larger than the correction limit width ± v of the first low temperature learning value P _S2 C, and is used for normal temperature learning. The width is set to be smaller than the correction limit width ± t of the value P _S2 A (that is, t>u> v).

The calculation of the learning value for the standby pressure P _S2 and the calculation of the learning value for the engagement start pressure P _TA are the normal temperature learning values P _S2 A and P _TA A, the first low temperature learning values P _S2 C and P _TA. C, the second low-temperature learning value P _S2 B ′, P _TA B ′, and the second low-temperature learning value P _S2 C ′, P _TA C ′ are the same calculations, and hence the description of these calculations is omitted. To do.

Thus, after the first low temperature learning values P _S2 B and P _TA B are calculated by the individual learning means 28, the changes P _S2 ΔB and P _TA ΔB are recorded the previous time based on the calculation results. The first low temperature learning values P _S2 B and P _TA B are added and subtracted and recorded as new first low temperature learning values P _S2 B and P _TA B in the non-volatile memory or the like, and the process proceeds to step S11. .

Further, in step S6, for example, when the oil temperature is between Temp3 and Temp4 and the discrimination result of the oil temperature state is the middle / low temperature state Cold-Mid, the process similarly proceeds to step S10, and the individual learning means 28 However, the calculation of the first low temperature learning values P _S2 C and P _TAC for the standby pressure P _S2 and the engagement start pressure P _TA is performed with the correction widths ± s and ± v as the limits, and the non-volatile memory or the like is similarly applied. And proceed to step S11.

On the other hand, when the oil temperature is between Temp5 and Temp6 and the discrimination result of the oil temperature state is the normal temperature state Normal in step S6, for example, the process proceeds to step S7, where the individual learning means 28 The calculation of the learning values P _S2 A, P _TA A for normal temperature with respect to the pressure P _S2 and the engagement start pressure P _TA is performed with the correction widths ± q, ± t as the limits, and is recorded in the non-volatile memory or the like. Then, learning reflection control by the learning reflection means 29 is performed.

Note that the learned values P _S2 A and P _TA A for learning are the corrected ranges ± s and ± v of the first low temperature learned values P _S2 C and P _TAC , or the first low temperature learned value P. _If the correction widths ± r, ± u of _S2 B and P _TA B are _exceeded , the correction widths ± s, ± v, ± r, ± u are expanded to the values of the learning values P _S2 A, P _TA A for normal temperature Perform reconfiguration.

In the learning reflection control, the learning value P _S2 A, P _TA A for normal temperature calculated based on the shifting in the normal temperature state, which is more reliable than the shifting in the low temperature state, is used as the first learning value P _S2 B, This is control for reflecting in P _TA B and the first low-temperature learning value P _S2 C, P _TAC , and the reflection is performed by 12 reflection patterns as shown in FIG. In the description of the pattern in FIG. 6, the learning values P _S2 A and P _TA A for normal temperature are “A” and the first low-temperature learning values P _S2 B and P _TA B are “ B ”, the first low-temperature learning values P _S2 C and P _TA C are abbreviated as“ C ”, and the change amounts P _S2 ΔA and P _TA ΔA are abbreviated as“ ΔA ”.

That is, in the pattern A, before learning cold learning value _P S2 _{A, P TA} A first low-temperature learned value _P S2 _{B, P TA} B or the first low-temperature learned value _P S2 _{C, P TA} The learning amount P _S2 A, P _TA A after learning is the first low-temperature learning value P _S2 B, P, which is smaller than C and the increase amount of the calculated change amount P _S2 ΔA, P _TA ΔA is small. _In this case, the first low temperature learning value P _S2 B, P _TA B and the first low temperature learning value P _S2 C, are smaller than _TA B or the first low temperature learning value P _S2 C, P _TAC . No correction is made to P _TAC , that is, no learning of shifting at normal temperature is reflected in learning of shifting at low temperature.

In the pattern B, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for low temperatures P _S2 B and P _TA B or the first learning values for low temperatures P _S2 C and P _TA C. Although small, the calculated changes P _S2 ΔA and P _TA ΔA are increased, and the learning values for normal temperature P _S2 A and P _TA A after learning are the first low-temperature learning values P _S2 B, P _TA B or first This is a case where the learning value P _S2 C, P _TA C is lower than the first low temperature learning value P _S2 B, P _TA B and the first low temperature learning value P _S2 C, P _TA C. The learning values P _S2 A and P _TA A for normal temperature after learning are reflected on the first learning value P _S2 B and P _TA B for the first low temperature, and the learning values P _S2 C and P _TA C for the first low temperature. The learning values P _S2 A and P _TA A for normal temperature after learning are made the same.

In the pattern C, for example, the low temperature state shift is performed several times, and the first low temperature learning values P _S2 B and P _TA B or the first low temperature learning values P _S2 C and P _TAC are used as the individual learning means 28. The learning value for normal temperature P _S2 A, P _TA A before learning is the first low-temperature learning value P _S2 B, P _TA B or the first low-temperature learned value _P S2 _{C, P TA} greater than C, further computed amount of change _{P S2 ΔA, P TA ΔA} is increased cold learning value _P S2 a after _{learning, P TA} This is a case where A remains larger than the first low-temperature learning value P _S2 B, P _TA B or the first low-temperature learning value P _S2 C, P _TA C. In this case, the first low-temperature learning value P _S2 B , _{P TA} B and the first low-temperature learned value _P S2 _C, room temperature after learning the _{P TA} C Learned value _P S2 _{A, P TA} value of A reflects, i.e. first low-temperature learned value _P S2 _{B, P TA} B and the first low-temperature learned value _P S2 _{C, P TA} C to the calculated amount of change P _S2 ΔA and P _TA ΔA are added.

In the pattern D, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for low temperatures P _S2 B and P _TA B or the first learning values for low temperatures P _S2 C and P _TA C. The small and calculated change amounts P _S2 ΔA, P _TA ΔA are decreased, and the learning values P _S2 A, P _TA A after learning are also the first low-temperature learning values P _S2 B, P _TA B or 1 for low temperature learned value _P S2 _C, a case remains less than _{P TA} C, this time is for the first low-temperature learned value _P S2 _{B, P TA} B and the first low-temperature learned value _P S2 _{C, P TA} No correction is made to C, that is, no learning of shifting at normal temperature is reflected in learning of shifting at low temperature.

In the pattern E, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for low temperatures P _S2 B and P _TA B or the first learning values for low temperatures P _S2 C and P _TA C. The learning values P _S2 A and P _TA A after learning in which the large and calculated change amounts P _S2 ΔA and P _TA ΔA are reduced are the first low-temperature learning values P _S2 B, P _TA B or the first low temperature learned value _P S2 _C, a case remains greater than _{P TA} C, this time is for the first low-temperature learned value _P S2 _{B, P TA} B and the first low-temperature learned value _P S2 _{C, P TA} C _Are reflected in the learning values P _S2 A, P _TA A for normal temperature after learning, that is, in the first low-temperature learning values P _S2 B, P _TA B and the first low-temperature learning values P _S2 C, P _TA C The calculated change amounts P _S2 ΔA and P _TA ΔA are subtracted.

In the pattern F, the learning values P _S2 A, P _TA A for normal temperature before learning are the first learning values for the low temperature P _S2 B, P _TA B or the first learning values for the low temperature P _S2 C, P _TA C. The learning values P _S2 A and P _TA A after learning in which the large and calculated change amounts P _S2 ΔA and P _TA ΔA are reduced are the first low-temperature learning values P _S2 B, P _TA B or the first This is a case where the learning value becomes lower than the low temperature learning value P _S2 C, P _TA C. In this case, the first low temperature learning value P _S2 B, P _TA B and the first low temperature learning value P _S2 C, P _TA C _Are reflected in the learning values P _S2 A, P _TA A for normal temperature after learning, that is, in the first low-temperature learning values P _S2 B, P _TA B and the first low-temperature learning values P _S2 C, P _TA C The calculated change amounts P _S2 ΔA and P _TA ΔA are subtracted.

In the pattern G, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for the low temperature P _S2 B and P _TA B or the first learning values for the low temperature P _S2 C and P _TA C. The learning values P _S2 A and P _TA A after learning in which the calculated change amounts P _S2 ΔA and P _TA ΔA are reduced but the learning values P _S2 A and P _TA A after learning are the first learning values P _S2 B, P _TA B or the first This is a case where the learning value P _S2 C, P _TAC is smaller than the low temperature learning value P _S2 C, and the first and second low temperature learning values P _S2 B, P _TA B and the first low temperature learning value P _{S2 are obtained.} The learning values P _S2 A and P _TA A after learning are reflected in C and P _TA C, that is, the first low temperature learning values P _S2 B and P _TA B and the first low temperature learning value P _S2 C , _{P TA} C to the calculated amount of change _{P S2 .DELTA.A,} subtracts the _{P TA} .DELTA.A.

In the pattern H, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for low temperatures P _S2 B and P _TA B or the first learning values for low temperatures P _S2 C and P _TA C. The learning values P _S2 A and P _TA A for learning after learning, which are large but the calculated changes P _S2 ΔA and P _TA ΔA are greatly reduced, are the first low-temperature learning values P _S2 B and P _TA B or This is a case where the learning value becomes smaller than the first low-temperature learning value P _S2 C, P _TAC and becomes positive and negative. In this case, the first low-temperature learning value P _S2 B, P _TA B and the first low-temperature learning value The learning values P _S2 A and P _TA A after learning are reflected in P _S2 C and P _TAC , that is, the first low-temperature learning values P _S2 B and P _TA B and the first low-temperature learning value P _{S2 C, P TA} C to the calculated amount of change _{P S2 .DELTA.A,} subtracts the _{P TA} .DELTA.A.

In pattern I, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for low temperatures P _S2 B and P _TA B or the first learning values for low temperatures P _S2 C and P _TA C The calculated change amounts P _S2 ΔA and P _TA ΔA are increased, and the learning values P _S2 A and P _TA A for learning after learning are the learning values P _S2 B and P _TA B for the first low temperature or This is a case where the first low-temperature learning values P _S2 C and P _TAC remain positive and negative and the values approach each other. In this case, the first low-temperature learning values P _S2 B, P _TA B and the first low temperature No correction is made to the learned values P _S2 C and P _TAC for use, that is, no learning of gear shift in the normal temperature state is reflected in learning of gear shift in the low temperature state.

In the pattern J, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for low temperatures P _S2 B and P _TA B or the first learning values for low temperatures P _S2 C and P _TA C The calculated change amounts P _S2 ΔA and P _TA ΔA are increased, and the learning values P _S2 A and P _TA A for learning after learning are the learning values P _S2 B and P _TA B for the first low temperature or the first low-temperature learned value _P S2 _C, a case where the value is approaching with _{P TA} C and polarity are the same, this time, the first low-temperature learned value _P S2 _B, for _{P TA} B and the first low temperature No correction is made to the learned values P _S2 C and P _TAC , that is, no learning of shifting at normal temperature is reflected in learning of shifting at low temperature.

In the pattern K, the learning value P _S2 A, P _TA A for normal temperature before learning is the first learning value for low temperature P _S2 B, P _TA B or the first learning value for low temperature P _S2 C, P _TA C The calculated change amounts P _S2 ΔA, P _TA ΔA are significantly increased, and the learning values P _S2 A, P _TA A for learning after learning are the first low-temperature learning values P _S2 B, P _TA. B or the first low-temperature learning value P _S2 C, P _TA C is the same as the positive and negative values and increases (the value goes away). In this case, the first low-temperature learning value P _S2 B, P _The learning values P _S2 A and P _TA A after learning are reflected in _TA B and the first low temperature learning values P _S2 C and P _TAC , that is, the first low temperature learning values P _S2 B and P _TA. B and first low-temperature learning value P _S2 C, P _TAC and learning temperature learning value P _S2 A, P _T after learning _{A Make} A the same.

In the pattern L, the learning values P _S2 A and P _TA A for normal temperature before learning are the first learning values for the low temperature P _S2 B and P _TA B or the first learning values for the low temperature P _S2 C and P _TA C, respectively. The calculated changes P _S2 ΔA and P _TA ΔA are further reduced, and the learning values P _S2 A and P _TA A for learning after learning are the first low-temperature learning values P _S2 B and P _TA B. Alternatively, the first low-temperature learning value P _S2 C, P _TAC is smaller than the first negative learning value P _S2 B, P _TA B. In this case, the first low-temperature learning value P _S2 B, P _TA B And the learning values P _S2 A, P _TA A after learning are reflected in the first low-temperature learning values P _S2 C, P _TAC , that is, the first low-temperature learning values P _S2 B, P _TA B and the first low-temperature learned value _P S2 _{C, P TA} C to the calculated amount of change _{P S2 .DELTA.A,} subtracts the _{P TA} .DELTA.A That.

The 12 patterns are cases where the first low-temperature learning values P _S2 B and P _TA B or the first low-temperature learning values P _S2 C and P _TAC are positive values, and the signs are reversed. There are 12 identical patterns, that is, there are a total of 24 reflected patterns, which are the same as the patterns A to L, and the description thereof is omitted.

The above reflection patterns can be roughly divided.
(1) When the learning values P _S2 A and P _TA A for normal temperature before learning are larger than the first low-temperature learning values P _S2 B and P _TA B or the first low-temperature learning values P _S2 C and P _TA C (Patterns C, E, F, H), the amount of change P _S2 ΔA, P _TA ΔA between the learning value P _S2 A and P _TA A for normal temperature before and after learning is used as the first low-temperature learning value P _S2. Reflected in B, P _TA B, or first low temperature learning value P _S2 C, P _TAC .
(2) The learning value P _S2 A, P _TA A for normal temperature before learning is smaller than the first low temperature learning value P _S2 B, P _TA B or the first low temperature learning value P _S2 C, P _TA C, and When the learning values P _S2 A and P _TA A for normal temperature after learning are larger than the first learning values for low temperature P _S2 B and P _TA B or the first learning values for low temperature P _S2 C and P _TA C (pattern B , K), directly reflects ambient temperature for learning value _P S2 a after _learning, the _{P TA} a first low-temperature learned value _P S2 _{B, P TA} B or the first low-temperature learned value _P S2 _C, the _{P TA} C .
(3) The learning values for normal temperature P _S2 A and P _TA A after learning are values that are positive and negative with respect to the first low-temperature learning values P _S2 B and P _TA B or the first low-temperature learning values P _S2 C and P _TA C in, and room temperature for learning value _P S2 a after _{learning, P TA} a first low-temperature learned value _P S2 _{B, P TA} B or the first low-temperature learned value _P S2 _C, when away than _{P TA} C (Patterns G, H, and L), the amounts of change P _S2 ΔA and P _TA ΔA between the learning values P _S2 A and P _TA A for normal temperature before and after learning are used as the first low-temperature learning values P _S2 B and P, respectively. Reflected in _TA B or first low temperature learning value P _S2 C, P _TAC .
(4) There is no reflection when it does not fall under (1) to (3) above.
It can be divided into four.

Thus, the first low temperature learning value P _S2 B, P _TA B or the first low temperature learning value P _S2 C, P _TAC individually learned by the individual learning means 28 can be used without changing the room temperature. The learning results of the learning values P _S2 A and P _TA A can be reflected in the first low-temperature learning values P _S2 B and P _TA B or the first low-temperature learning values P _S2 C and P _TA C, that is, the normal temperature state The learning of the shift in the low temperature state can also be advanced by the learning of the shifting.

As described above, the normal temperature learning values P _S2 A and P _TA A are the correction ranges ± s and ± v of the first low temperature learning values P _S2 C and P _TAC , or the first low temperature learning value. When the correction widths ± r, ± u of P _S2 B and P _TA B are _exceeded , these correction widths ± s, ± v, ± r, ± u are the values of the learning values P _S2 A, P _TA A for normal temperature. Since resetting corresponding to enlargement is performed, the above-described learning values are always reflected.

  Subsequently, as shown in FIG. 4, when the learning reflection control in step S8 is completed, the process proceeds to step S9, and initial learning completion determination control by the initial learning completion determination means 25 is started. In this initial learning completion determination control, for example, whether or not there is a change in learning continuously for a predetermined number of times in the learning of the shift in the normal temperature state where the determination of the completion of initial learning has not been made (S7) It is determined whether or not the speed change has continued for a predetermined number of times. For example, in the learning of the gear change in the normal temperature state (S7), when the completion of the initial learning is not determined, that is, when the learning is changed, nothing is performed until the determination of the completion of the initial learning described later, and the process proceeds to step S11.

In the above description, the individual learning by the individual learning means 28 before the completion of the initial learning is determined (steps S7 and S10). However, in step S6, the shift state determination means 24 is in the middle / low temperature state Cold-Mid. When the state other than the high and low temperature state Cold-High and the normal temperature state Normal is determined, that is, when the lowest low temperature state Cold-Low1, the low and low temperature state Cold-Low2 and the high temperature state Hot are determined, it is caused by the oil viscosity. Therefore, the process proceeds to step S11 as it is, that is, the normal temperature learning values P _S2 A and P _TA A, the first low temperature learning values P _S2 B and P _TA B, and the first low temperature learning value P. _S2 C and _PTAC do not learn anything.

As described above, the learning values P _S2 A, P _TA A for the normal temperature, the first learning values for the low temperature P _S2 B, P _TA B, and the first learning values for the low temperature P _S2 C, P _TA C by the individual learning means 28 are obtained. When the next 2-3 upshift shift is determined by the shift control means 21 in the state of learning, and the shift is started (S11), here, the initial learning completion by the initial learning completion determination means 25 is completed. Since the determination is not made (No in S12), the process proceeds to step S16, and the temperature state shown in FIG. 5A is determined by the oil temperature state determination unit 24. If so, the process proceeds to step S17, and if it is lower than the low temperature (that is, less than Temp5), the process proceeds to step S18.

In step S17, as shown in FIG. 5A, the shift control means 21 learns from the non-volatile memory for normal temperature in either the normal temperature state Normal or the high temperature state Hot in step S17. The values P _S2 A and P _TA A are read out (that is, the learning value and the learning value (1) to be developed), and learning at normal temperature is performed for the standby pressure _PS2 and the engagement start pressure _{PTA in} the above-described hydraulic control (see FIG. 7). Based on the hydraulic pressure command value obtained by adding the values P _S2 A and P _TA A, the engagement side hydraulic pressure P _B4 is hydraulically controlled. If this shift is a normal-mode normal shift, the shift state at this time is detected by the shift state detection means 22, and the normal temperature learning values P _S2 A and P _TA A are learned again in step S7. The “learning value to be developed” refers to the case where the learning value is not learned in step S7 but is used exclusively for the hydraulic pressure command value.

On the other hand, if the temperature state is lower than the low temperature and the high / low temperature state Cold-High in step S18, the shift control means 21 reads the first low temperature learning values P _S2 B and P _TA B from the nonvolatile memory. If the lowest low temperature state Cold-Low1, the low low temperature state Cold-Low2, and the intermediate low temperature state Cold-Mid, the shift control means 21 obtains the first low-temperature learning values P _S2 C and P _TA C from the nonvolatile memory. Reading (ie, learning value / learning learning value (1)), the first low-temperature learning value P _S2 B, P _TA for the standby pressure P _S2 and the engagement start pressure P _TA in the above-described hydraulic pressure control (see FIG. 7). The engagement side hydraulic pressure P _B4 is hydraulically controlled based on the hydraulic pressure command value obtained by adding B or the first low temperature learning value P _S2 C, P _TAC . If this shift is a mid-low temperature Cold-Mid shift, the shift state at this time is detected by the shift state detecting means 22, and the first low temperature learning value P _S2 C, P _TA C is again detected in step S10. If this shift is a high-low temperature Cold-High shift, the shift state at this time is detected by the shift state detecting means 22, and the first low-temperature learning value P _S2 B, P is again detected in step S10. _TAB is learned.

As described above, if the completion of initial learning is determined by the initial learning completion determination unit 25 in step S9 when the control before the determination of completion of initial learning is being performed, the nonvolatile memory (not shown) The completion of the initial learning is recorded in the sex memory, and thereafter, the completion of the initial learning is determined in step S2 and step S12, that is, the individual learning by the individual learning means 28 described above is completed. Further, when it is determined that the initial learning is completed, the learning control means 26, as shown in FIG. 6B, the first low temperature learning value P _S2 B, P _TA B and the first low temperature learning at that time. the value _P S2 _C, the _{P TA} C, room temperature learning value _P S2 _{a, P TA} a second low-temperature learned value _{P S2 B ', P TA B} ' and the second low-temperature learned value _{P S2} C ', _{P TAC} 'is assigned and calculated, and the learning values P _S2 A, P _TA A for the normal temperature, the learning values P _S2 B', P _TA B 'for the second low temperature, and the learning values P _S2 C', P _TA for the second low temperature are calculated. A value obtained by adding C ′ is set to the same value as the first low-temperature learning value P _S2 B, P _TA B and the first low-temperature learning value P _S2 C, P _TA C.

After the completion of the initial learning is thus determined and the second low-temperature learning values P _S2 B ′ and P _TA B ′ and the second low-temperature learning values P _S2 C ′ and P _TA C ′ are set, 2 When the -3 upshift shift is completed (S1), the initial learning is completed (Yes in S2). Therefore, the process proceeds to step S3, and based on the determination result of the oil temperature state determination means 24, the 2-3 upshift shift is performed. If the normal temperature state is normal, the process proceeds to step S4, and the normal temperature base learning means 28, as in step S7, has the normal temperature learning values P _S2 A and P _TA A as shown in FIG. Learning continues from individual learning.

On the other hand, if the 2-3 upshift is in the high / low temperature state Cold-High or the intermediate / low temperature state Cold-Mid based on the determination result of the oil temperature state determination unit 24, the process proceeds to Step S5, As shown in FIG. 5A, the learning means 28 uses the normal temperature learning values P _S2 A and P _TA A as a base to obtain learning values obtained by correcting the normal temperature learning values P _S2 A and P _TA A. The second low temperature learning value P _S2 B ′, P _TA B ′ or the second low temperature learning value P _S2 C ′, P _TA C ′ is learned. The correction ranges of the second low-temperature learning values P _S2 B ′, P _TA B ′ and the second low-temperature learning values P _S2 C ′, P _TA C ′ are respectively ± w, ± y, ± x, ± z (± w> ± x, ± y> ± z), which is set to a range that is significantly smaller than the correction widths ± q, ± t of the learning values P _S2 A, P _TA A for normal temperature . Therefore, the second low temperature learning value P _S2 B ′, P _TA B ′ or the second low temperature learning value P _S2 C ′, P _TA C ′ is obtained by learning the low temperature shift by the room temperature base learning means 28. It is prevented from becoming too large to reduce the reliability of the shift control in the low-temperature shift, and the reliability based on the learning values P _S2 A and P _TA A for normal temperature even in the low-speed shift It is possible to perform high speed shift control.

As described above, the normal temperature learning value P _S2 A, P _TA A, the second low temperature learning value P _S2 B ′, P _TA B ′, and the second low temperature learning value P _S2 C ′, In the state where _PTAC 'is learned, when the next 2-3 upshift is determined by the shift control means 21 and the shift is started (S11), the initial learning completion determination means 25 has already started the initial shift. Since the learning completion has been determined (Yes in S12), the process proceeds to step S13, where the oil temperature state determining means 24 determines which temperature state is shown in FIG. If it is Temp 5 or more, the process proceeds to Step S14, and if it is lower than the low temperature (that is, less than Temp 5), the process proceeds to Step S15.

In step S14, as shown in FIG. 5 (a), the shift control means 21 learns from the non-volatile memory for normal temperature in either the normal temperature state Normal or the high temperature state Hot in step S14. The values P _S2 A and P _TA A are read out (that is, the learning value and the learning value (1) to be developed), and similarly, the standby pressure P _S2 and the engagement start pressure P _TA in the above-described hydraulic control (see FIG. 7). The engagement-side hydraulic pressure P _B4 is hydraulically controlled based on the hydraulic pressure command value obtained by adding the learning values for normal temperature P _S2 A and P _TA A. If this shift is a normal-speed normal shift, the shift status at this time is detected by the shift status detection means 22, and the normal temperature learning values P _S2 A and P _TA A are learned again in step S4.

If the temperature state is lower than the low temperature and the high / low temperature state Cold-High in step S15, the shift control means 21 uses the non-volatile memory for the normal temperature learning values P _S2 A, P _TA A and the second low temperature. Learning values P _S2 B ′ and P _TA B ′ are read out (that is, the learning value / learning value (1) to be developed), and the lowest low-temperature state Cold-Low1, the low-low-temperature state Cold-Low2, and the low-temperature state Cold- If it is Mid, the shift control means 21 reads out the normal temperature learning values P _S2 A, P _TA A and the second low temperature learning values P _S2 C ′, P _TA C ′ from the non-volatile memory (that is, learning values / development). learning value (1) learning value to expand (2)), the standby pressure _{P S2} and the oncoming pressure _{P TA} and the normal-temperature learned value _P S2 a in the hydraulic control described above (see FIG. _{7), P TA} a and second low-temperature learned value P _{2 B ', P TA B'} , or ambient learning value _P S2 _{A, P TA} A and the second low-temperature learned value _{P S2 C ', P TA C} ' based on the hydraulic pressure command value obtained by adding the engagement-side oil pressure P _B4 is hydraulically controlled.

If this shift is a medium-low temperature Cold-Mid shift, the shift state at this time is detected by the shift state detecting means 22, and the second low-temperature learning values P _S2 C ′, P _TA are again detected in step S5. If C ′ is learned and this shift is a high-low-temperature Cold-High shift, the shift state at this time is detected by the shift state detecting means 22, and the second low-temperature learning value P _S2 B is detected again in step S5. ', P _TAB ' is learned.

As described above, according to the speed change control device 1 of the automatic transmission, the individual learning means 28 is based on the discrimination result by the oil temperature state discriminating means 24 and the normal temperature shift, the low temperature conditions Cold-High, Cold-Mid. The learning value P _S2 A, P _TA A for the normal temperature and the first learning value P _S2 B, P _TA B, P _S2 C, P _TAC for the normal temperature are individually learned at the shift, so that the low temperature state Cold-High , Cold-Mid only, the learning reflection means 29 can be used as the individual learning means 28 while the shift quality in the low-temperature conditions Cold-High, Cold-Mid can be improved. the cold learning value _P S2 A _{learned, P TA} A and the first low-temperature learned value _{P S2 B, P TA B,} P S2 C, and _{P TA} C Since one of the learning results is reflected in the learning value of the other, the learning result of one of the learning values can be obtained even when the vehicle is running only at either the normal temperature state Normal or the low temperature state Cold-High or Cold-Mid. Thus, it is possible to perform highly reliable shift control at both a normal temperature and a low temperature shift.

Further, until the individual learning unit 28 determines the completion of the initial learning by the initial learning completion determination unit 25, the learning value for the normal temperature P _S2 A, P _TA A and the first low temperature learning value P _S2 B, P _TA B, Individual learning with P _S2 C and P _TAC is performed, and after the normal temperature base learning means 27 determines that the initial learning is completed by the initial learning completion determination means 25, the normal temperature learning value P _{S2 is changed} at a normal temperature state Normal shift. _{a, P TA} continued learning a, and low temperature cold-High, cold-Mid room temperature for learning value _P S2 a in _{shift, P TA} a second low-temperature learned value _{P S2} is set as the base Since B ′, P _TA B ′, P _S2 C ′, and P _TAC C ′ are learned, even before the completion of initial learning is determined, the normal state shift and the low state shift are reflected by the reflection of the learning reflecting means. Shifting in Can improve the utility, initial after completion of the learning is the shift of both the normal temperature and low temperature, high reliability to high normal-temperature learned value P _{S2 A reliable,} the P TA _A base shift It may be possible to perform control.

Further, the learning reflecting means 29 calculates one of the learning results of the normal temperature learning values P _S2 A, P _TA A and the first low temperature learning values P _S2 B, P _TA B, P _S2 C, P _TA C. Since it is reflected in the other learning value and the learning result of the other learning value is not reflected in one learning value, one learning result with higher reliability can be reflected in the other learning value, and reliability can be improved. It is possible to prevent the other learning result lacking from being reflected in one learning result with high reliability.

In particular, the learning reflection means 29, for room temperature learned value _P S2 _{A, P TA} A first low-temperature learned value _P S2 _B a learning _{result, P TA B, P S2 C} , so to be reflected in the _{P TA} C, trust The learning result of the normal temperature learning values P _S2 A and P _TA A can be reflected in the first low temperature learning values P _S2 B, P _TA B, P _S2 C, and P _TA C, and the low temperature shift Thus, it is possible to perform highly reliable shift control.

Further, the learning reflecting means 29, when the learning value for normal temperature P _S2 A, P _TA A before learning is larger than the first learning value for low temperature P _S2 B, P _TA B, P _S2 C, P _TA C, The amount of change P _S2 ΔA, P _TA ΔA before and after learning in the normal temperature learning values P _S2 A, P _TA A is used as the first low temperature learning values P _S2 B, P _TA B, P _S2 C, P. since reflected in _TA C, without significantly changing the individual learning means 28 by individually learned first low-temperature learned value _{P S2 B, P TA B,} P S2 C, P TA C, reliable for room temperature learned value _P S2 _{a, P TA} a learning result of the first low-temperature learned value _{P S2 B, P TA B,} P S2 C, can be reflected in the _{P TA} C, reliable shifting of the low temperature It is possible to perform high speed shift control.

Further, the learning reflection means 29 is such that the learning values for normal temperature P _S2 A and P _TA A before learning are smaller than the first low-temperature learning values P _S2 B, P _TA B, P _S2 C and P _TA C and learning is performed. When the later learning value for normal temperature P _S2 A, P _TA A is larger than the first low temperature learning value P _S2 B, P _TA B, P _S2 C, P _TAC , the learning value for normal temperature after learning P _S2 Since A and P _TA A are reflected in the first low-temperature learning value P _S2 B, P _TA B, P _S2 C and P _TAC , the first low-temperature learning value P learned individually by the individual learning means 28. _{S2 B, P TA B, P} S2 C, P TA without significantly changing the C, high room temperature learning value _P S2 a _{reliable, P TA} a learning result of the first low-temperature learned value _{P S2} B _{, P TA B, P S2 C} , can be reflected in the _{P TA} C, in shifting the low temperature It may be possible to perform the security capabilities shift control.

Further, the learning reflecting means 29 is such that the learning values P _S2 A, P _TA A for normal temperature after learning are values that are positive and negative with respect to the first low-temperature learning values P _S2 B, P _TA B, P _S2 C, P _TA C. and room temperature for learning value _P S2 a after _{learning, P TA} a first low-temperature learned value _{P S2 B, P TA B,} P S2 C, P TA C when away than, for the normally temperature learned value P _Since the changes P _S2 ΔA and P _TA ΔA before and after learning in _S2 A and P _TA A are reflected in the first low-temperature learning values P _S2 B, P _TA B, P _S2 C and P _TA C. The first low-temperature learning values P _S2 B, P _TA B, P _S2 C, and P _TA C individually learned by the individual learning means 28 are highly reliable and the learning values for normal temperatures P _S2 are high. _{a, P TA} a learning result of the first low-temperature learned value _{P S2 B, P TA B,} P S2 , Can be reflected in the P TA _C, it may be capable of performing a highly reliable shift control in shift low temperature.

Further, the individual learning means 28 uses the first low temperature learning values P _S2 B, P _TA B, P _S2 C, and P _TA rather than the correction limit widths ± q and ± t of the normal temperature learning values P _S2 A and P _TA A. Since the correction limit widths ± r, ± u, ± s, ± v of C are set to be small, the first low-temperature learning values P _S2 B, P _TA B, P are obtained by learning in a low-temperature shift with low reliability. While it is possible to prevent _S2 C and P _{TAC from} becoming a significantly incorrect value, the normal temperature learning values P _S2 A and P _TA A are the first low temperature learning values P _S2 B, When the correction limit widths of P _TA B, P _S2 C, and P _TA C are larger than ± r, ± u, ± s, ± v, the first low temperature learning values P _S2 B, P _TA B, _{P S2 C,} P _TA C correction limit width ± r, ± u, ± s , ± v the greater since the normal-temperature learned value _P S2 a, P Since reset to _A A, ambient temperature learning value _P S2 _{A, P TA} A learning result of the first low-temperature learned value _{P S2 B, P TA B,} P S2 C, be always reflected in _{P TA} C it can.

Further, the shift speed change status detection unit 24, since detecting the transmission status based on a change in the rotational speed N _IN of the input shaft 3 at the time of speed change, learning control means 26, the engine racing and tie-up, considering shift shock and the like Learning values can be learned based on the situation.

  Further, since the shift state detecting means 22 detects the shift state based on the time measurement result of the speed change timer means 23, the learning control means 26 learns the learning value based on the shift state in consideration of various time passages in the shift. It can be carried out.

Further, since the learning value for correcting the hydraulic pressure command value P _B4 learned by the learning control means 26 is a learning value for the standby pressure P _S2 before engaging the fourth brake B-4, shifting ( Engagement) Learning can be performed to prevent shocks, shift time delays, and the like.

Further, the learning value for correcting the hydraulic pressure command value P _B4 learned by the learning control means 26 is a learning value for the engagement start pressure P _TA for starting the engagement of the fourth brake B-4. You can learn to prevent blowing and tie-up.

The fourth brake B-4 is, since a band brake, the learning of the engagement starting pressure P _TA is not sufficient, prone to engaging shock due to the entrainment of the brake band, but running at only a low temperature Even in the case where the learning can be performed in the low temperature shift, and when the initial learning is completed, the highly reliable learning based on the learning in the normal temperature shift can be performed. Further, since the learning result of one of the learning values can make it possible to perform highly reliable shift control at both the normal temperature and low temperature shifts, it is possible to prevent the occurrence of engagement shock. .

  Further, since the gear shift for learning is a power-on upshift gear shift, it is possible to perform the hydraulic control of the clutch or brake on the engagement side in the clutch / brake reshuffling gear shift with high accuracy.

  In the embodiment according to the present invention described above, an example in which the shift control device 1 is applied to the FF type automatic transmission 20 that achieves, for example, the fifth forward speed and the first reverse speed has been described. Of course, the present shift control device 1 may be applied to any automatic transmission.

In the present embodiment, the 2-3 upshift is taken as an example, and the hydraulic pressure command value P _B4 supplied to the hydraulic servo of the fourth brake B-4 is taken as an example of the engagement side hydraulic pressure. However, the present invention is not limited to this, and any type of shifting (for example, power-off shifting, downshift shifting, etc.) may be used as long as it is a shifting that re-engages the friction engagement elements. The hydraulic pressure command value for such friction system elements may be used.

Further, in the present embodiment, the learning for the standby pressure and the engagement start pressure has been described as an example. However, the present invention is not limited thereto, and may be a pressure (P _S1 ) for loosening, That is, the present invention can be applied to any learning value for any hydraulic pressure command value.

In the present embodiment, the learning values P _S2 A and P _TA A are in the normal temperature state Normal, and the learning values P _S2 B, P _TA B and the learning value P _S2 B are in the high and low temperature Cold-High state. ', P _TA B' is in the low-temperature state Cold-Mid, learning values P _S2 C, P _TA C and learning values P _S2 C ', P _TA C' are learned, and other temperature states Hot, Cold- In the case of Low 2 and Cold-Low 1, those that only develop (read) these learning values have been described (see FIG. 5A), but this is not a limitation, and in all temperature states, Learning may be performed individually or based on room temperature, or may be performed only in two temperature states, for example, a normal temperature state Normal and a high / low temperature state Cold-High. Needless to say, these temperature states need not be distinguished from six types.

The skeleton figure which shows the automatic transmission which can apply this invention. Operation table of this automatic transmission. 1 is a block diagram showing a shift control device for an automatic transmission according to the present invention. The flowchart which shows learning control. It is a table | surface which shows the learning value according to oil temperature state, (a) is a table | surface which shows the time of individual learning, (b) is a table | surface which shows the time of normal temperature base learning. It is explanatory drawing which shows the reflection pattern of a learning value, (a) is a figure which shows the reflection pattern at the time of individual learning, (b) is a figure which shows the reflection pattern at the time of completion of initial learning. 2-3 is a time chart showing an input rotation speed and a hydraulic pressure command value at the time of shifting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shift control apparatus of automatic transmission 3 Input shaft 20 Automatic transmission 21 Shift control means 22 Shift condition detection means 23 Shift meter timing means 24 Oil temperature state determination means 25 Initial learning completion determination means 26 Learning control means 27 Normal temperature base learning means 28 Individual learning means 29 Learning reflecting means 31 Oil temperature detecting means 32 Input shaft rotational speed sensor B-4 Friction engagement element (fourth brake)
Normal Normal Temperature Cold-Mid Low Temperature (Medium / Low Temperature)
Cold-High Low temperature state (high and low temperature state)
P _B4 Oil pressure command value (engagement side oil pressure)
P _S2 standby pressure P _S2 A (standby pressure) learning value P _S2 ΔA change amount P _S2 B (standby pressure) first low temperature learning value P _S2 C (standby pressure) first low temperature learning value P _S2 B ′ (second standby pressure) second low temperature learning value P _S2 C ′ (standby pressure) second low temperature learning value P _TA engagement start pressure P _TA A (engagement start pressure) normal temperature learning value P _TA ΔA change amount P _TA B (learning start pressure) first low temperature learning value P _TA C (engagement start pressure) first low temperature learning value P _TA B ′ (engagement start pressure) second low temperature Learning value _PTAC '(for engagement start pressure) Second low temperature learning value ± q Correction limit width ± t Correction limit width ± w Correction limit width ± x Correction limit width ± y Correction limit width ± z Correction limit width

Claims (14)

A shift condition detecting means for detecting a shift condition at the time of a shift, and learning for correcting the command value of the hydraulic pressure supplied to the hydraulic servo of the friction engagement element in the next shift control based on the detection result of the shift condition detecting means Shift control of an automatic transmission comprising learning control means for performing learning by calculating and recording a value, and shift control means for performing hydraulic control of a hydraulic servo of a friction engagement element based on a learning result by the learning control means In the device
Oil temperature detecting means for detecting the oil temperature;
Oil temperature state determination means for determining a shift in a normal temperature state and a shift in a low temperature state based on the oil temperature detected by the oil temperature detection means,
The learning control means includes
Individual learning means for individually learning the normal temperature learning value and the first low temperature learning value for the normal temperature state shift and the low temperature state shift, respectively, based on the determination result by the oil temperature state determination means;
Learning reflecting means for reflecting one of the learning results of the normal temperature learning value and the first low temperature learning value learned by the individual learning means on the other learning value;
A shift control apparatus for an automatic transmission. Initial learning completion determination means for determining completion of initial learning in which the learning progress state by the learning control means is equal to or higher than a predetermined progress state at the shift in the normal temperature state determined by the oil temperature state determination means;
The individual learning means, based on the determination result by the oil temperature state determination means, until the initial learning completion determination means determines the initial learning completion, the normal temperature learning value and the first low temperature learning value, Learn each
After the initial learning completion is determined by the initial learning completion determination unit, the learning control unit learns the learning value for normal temperature in the shift at the normal temperature state based on the determination result by the oil temperature state determination unit. And the normal temperature base learning means for learning the second low temperature learning value set based on the normal temperature learning value in the low temperature shift.
The shift control apparatus for an automatic transmission according to claim 1. The learning reflecting means reflects one of the learning results of the normal temperature learning value and the first low temperature learning value learned by the individual learning means to the other learning value, and The learning result is not reflected on the one learning value.
The shift control apparatus for an automatic transmission according to claim 1 or 2, The learning reflecting means reflects the learning result of the learning value for normal temperature in the learning value for the first low temperature,
The shift control device for an automatic transmission according to claim 3. When the learning value for normal temperature before learning is larger than the learning value for the first low temperature, the learning reflecting means calculates the amount of change between the learning value for the normal temperature before and after learning in the first learning for low temperature. Reflected in the value,
The shift control apparatus for an automatic transmission according to claim 4. The learning reflecting means learns when the learning value for normal temperature before learning is smaller than the learning value for first low temperature and the learning value for normal temperature after learning is larger than the learning value for first low temperature. The subsequent learning value for normal temperature is reflected in the learning value for the first low temperature,
6. A shift control apparatus for an automatic transmission according to claim 4, wherein the shift control apparatus is an automatic transmission. The learning value for normal temperature and the learning value for the first low temperature have positive and negative values,
The learning reflecting means is configured such that the learning value for normal temperature after learning is a value that is positive and negative with respect to the learning value for the first low temperature, and the learning value for normal temperature after learning moves away from the learning value for the first low temperature. In addition, the amount of change in the learning value for normal temperature before and after learning is reflected in the first learning value for low temperature.
The shift control apparatus for an automatic transmission according to any one of claims 4 to 6. The individual learning means is configured to set a correction limit width of the first low temperature learning value smaller than a correction limit width of the normal temperature learning value, and the normal temperature learning value is equal to the first low temperature learning value. When the correction limit width is larger than the correction limit width, the correction limit width of the first low-temperature learning value is reset to the increased normal temperature learning value.
The shift control apparatus for an automatic transmission according to any one of claims 4 to 7. It has an input shaft speed sensor that detects the speed of the input shaft,
The shift state detecting means detects the shift state based on a change in the rotational speed of the input shaft during shift;
The shift control apparatus for an automatic transmission according to any one of claims 1 to 8, A transmission timing means for measuring the time elapsed in the shift;
The shift state detecting means detects the shift state based on a time measurement result of the shift time measuring means;
The shift control apparatus for an automatic transmission according to any one of claims 1 to 9, The learning value for correcting the hydraulic pressure command value learned by the learning control means is a learning value for the standby pressure before engaging the friction engagement element.
11. The shift control apparatus for an automatic transmission according to claim 1, wherein the shift control apparatus is an automatic transmission. The learning value for correcting the hydraulic pressure command value learned by the learning control means is a learning value for an engagement start pressure for starting engagement of the friction engagement element.
11. The shift control apparatus for an automatic transmission according to claim 1, wherein the shift control apparatus is an automatic transmission. The friction engagement element comprises a band brake;
13. The shift control apparatus for an automatic transmission according to claim 12, wherein The shift is a power-on upshift.
14. The shift control apparatus for an automatic transmission according to claim 1, wherein the shift control apparatus is an automatic transmission.

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