JP4955603B2 - Control device for automatic transmission - Google Patents

Description

  The present invention relates to a control device for an automatic transmission.

  An automatic transmission for a vehicle supplies hydraulic pressure to fastening elements such as a clutch and a brake, and fastens rotating elements such as a rotating drum and a gear, or a rotating element and a fixing element such as a case by using these fastening elements. Thus, switching of the gear ratio (shift speed) between the input shaft and the output shaft is automatically performed according to the driving state of the vehicle.

In an automatic transmission for a vehicle, a selection is made in advance as to which of the plurality of fastening elements is supplied with hydraulic pressure for each selection range and shift speed of a shift lever operated by a vehicle driver. The oil pressure is supplied to a predetermined fastening element by switching the oil passage and opening / closing the valve according to the range.
Each fastening element is supplied with hydraulic pressure regulated by a pressure regulating valve. The pressure regulating valve opens and closes the valve based on a command input from the electronic control unit, and the electronic control unit Control is performed to supply the set command pressure to the fastening element.

  FIG. 6 shows a change in the command pressure of the hydraulic pressure to be applied to the fastening element at the time of the shift from the first speed to the second speed (1 → 2 shift), and the change in the hydraulic pressure (actual pressure) actually applied to the fastening element at that time. FIG. 4 is a diagram showing a change in acceleration (front-rear G) acting in the front-rear direction of the automatic transmission at that time, and (a) shows a case of the first 1 → 2 shift performed for the first time after the engine is started ( b) shows the case of the second 1 → 2 shift.

In an automatic transmission, when the engine that does not drive the oil pump is stopped, most of the hydraulic oil (oil) in the oil passage that supplies the hydraulic pressure from the oil pump to each fastening element is discharged from the oil passage by its own weight, and the gear shifts. It is led to the oil pan at the bottom of the machine case.
Therefore, immediately after the engine is started, the oil passage is not filled with a sufficient amount of hydraulic oil. Therefore, when the first to second gear shift is performed for the first time immediately after the engine is started, the hydraulic oil is filled in the oil passage. As a result, the followability (hydraulic response) of the actual pressure with respect to the command pressure is deteriorated.

  In this case, since the stroke time of the piston for fastening the fastening element varies and the rising of the transmission torque of the fastening element is delayed, as shown in FIG. 6 (a), the fastening is started from the command pressure input (t1). The time ΔT1 until the actual pressure acting on the element reaches the shift start pressure (t2) becomes longer.

  Here, the command pressure is set so as to increase greatly after a predetermined time Tx has elapsed from the command pressure input (t1) in order to complete the shift. For this reason, when the time ΔT1 becomes long, the gear shift may be started after the command pressure increases. In this case, the fastening element is suddenly fastened with a large fastening torque, and the longitudinal G acting on the automatic transmission is large. Change and a shift shock occurs (see ΔG1).

Patent Document 1 discloses a shift control device that takes a long time (precharge time) until the start of increase in command pressure to prevent occurrence of such shift shock.
However, the time ΔT1 until the actual pressure reaches the shift start pressure varies depending on the engine stop time, the amount of hydraulic oil filled in the oil passage, the fluidity of the hydraulic oil, etc. It was difficult to set the time
JP-A-8-166058

Here, the shift shock described above is a case where the hydraulic fluid is sufficiently filled in the oil passage and the hydraulic pressure response to the command pressure is good, such as the first to second shift after the engine is started for the second time or later. It is hard to happen.
In such a case, as shown in FIG. 6B, the time ΔT2 until the actual pressure reaches the shift start pressure is sufficiently shorter than the time ΔT1, and the shift is started when the command pressure is low. Therefore, the front and rear G generated when the fastening element is fastened is small (see ΔG2), and a large shift shock is not caused.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the hydraulic responsiveness at the first shift performed after the engine is started and to prevent the occurrence of a shift shock.

  The present invention is a control device for an automatic transmission that obtains a plurality of shift stages by a combination of fastening and releasing of a plurality of fastening elements that are operated by hydraulic pressure, and is based on switching of a selection range of a shift lever. A plurality of fastening elements are operated by operating a judgment unit for judging the start of operation and a pressure regulating valve provided in each of the oil passages supplying hydraulic pressure to the plurality of fastening elements, and adjusting the hydraulic pressure supplied to each of the plurality of fastening elements. And a fastening control unit that locks and rotates the output shaft of the automatic transmission from the start of the engine until the start of operation of the automatic transmission is determined. In a state where the hydraulic pressure is supplied to the fastening elements to be fastened, the hydraulic pressure is sequentially supplied to the remaining fastening elements that are not fastened in order of priority.

According to the present invention, prior to the start of the operation of the automatic transmission, in a state in which the fastening elements that are combined to lock the rotation of the output shaft of the automatic transmission are fastened, the remaining fastening elements that are not fastened have priority. Hydraulic pressure is supplied in order from the fastening element having the highest degree.
As a result, before starting the operation of the automatic transmission, the oil pressure is supplied in order from the oil passage that supplies the hydraulic pressure to the fastening elements with higher priority among the oil passages that supply the hydraulic pressure to each fastening element. In the first shift, the amount of hydraulic oil consumed for filling the oil passage can be suppressed.
Therefore, the hydraulic response at the first shift performed after the engine starts is improved, and the occurrence of shift shock can be prevented.

Next, embodiments of the present invention will be described by way of examples.
FIG. 1 is a diagram showing a configuration of an automatic transmission to which the present invention is applied.
The engine 1 is connected to an automatic transmission 3 via a torque converter 2.
The output of the engine 1 is adjusted by a throttle valve that increases in opening degree from fully closed to fully open as the accelerator pedal is operated by the driver, and the output rotation of the engine 1 is transmitted through the torque converter 2 to the automatic transmission. 3 is input to the input shaft 4.

In the automatic transmission 3, a front planetary gear set 6 and a rear planetary gear set 7 are sequentially arranged from the engine 1 side on an input shaft 4 and an output shaft 5 that are coaxially arranged.
Front carrier front planetary gear set 6 that is located closer to the engine 1 includes a front sun gear S _F, a front ring gear R _F, which supports the front pinion P _F meshed with _them, and the front pinion P _F rotatably composed of a C _F.
Rear planetary gear set 7 located farther from the engine 1 includes a rear sun gear S _R, a rear ring gear R _R, these meshes rear pinion P _R, and the rear carrier C _R for rotatably supporting the rear pinion P _R Consists of

  The fastening elements that determine the power transmission path (speed stage) of the automatic transmission 3 include reverse clutch (R / C), high clutch (H / C), low clutch (L / C), low and reverse brake (L & R / B), low one-way clutch (L / OWC), and 2-speed and 4-speed brake (2-4 / B), each fastening element is a component of front planetary gear set 6 and rear planetary gear set 7 as follows Are provided in correlation with each other.

Front sun gear S _F, together are appropriately coupled to the input shaft 4 by R / C, there is a suitably fixable in automatic transmission 3 of the case by 2-4 / B.

Front carrier C _F is the appropriately coupled to the input shaft 4 by H / C. Further front carrier C _F, together with the L / OWC rotation of the reverse direction of the engine 1 by is prevented, are suitably fixable in automatic transmission 3 of the case by L & R / B.
And between the front carrier C _F and the rear ring gear R _R is capable suitably linked by L / C.
Further, between the front ring gear R _F and the rear carrier C _R are coupled to each other, a front ring gear R _F and the rear carrier C _R are coupled to the output shaft 5, the rear sun gear S _R coupled to the input shaft 4 is doing.

The automatic transmission 3 includes a selective coupling of fastening elements (R / C, H / C, L / C, L & R / B, 2-4 / B) indicated by a solid line ○ in FIG. 2 and a solid line ○ in FIG. L / OWC self-engagement indicated by a mark obtains a forward fourth speed and reverse first speed.
For example, the forward first speed is realized by fastening L / C and L / OWC as indicated by a solid line ◯.
The L & R / B indicated by the dotted line ◯ is fastened when engine braking is required. The fastening / release of these R / C, H / C, L / C, L & R / B, 2-4 / B is realized by the hydraulic control device 12 shown in FIG.

FIG. 3 shows a hydraulic control system for operating each of the fastening elements. In this figure, the commands output from the electronic control device 13 to the solenoids 10a to 10e and the flow of signals output from the hydraulic switches 11a to 11e to the electronic control device 13 are shown for simplification of the drawing. , They are displayed together.
As shown in FIG. 3, the hydraulic control device 12 is configured by arranging pressure regulating valves 9 a to 9 e and solenoids 10 a to 10 e in an oil passage 8 (8 a to 8 e) formed in the valve body.
The oil passage 8 connected to the oil pump OP includes an oil passage 8a to L & R / B, an oil passage 8b to 2-4 / B, an oil passage 8c to L / C, an oil passage 8d to H / C, and Branches to an oil passage 8e to R / C.
Each of these oil passages 8a to 8e is provided with pressure regulating valves 9a to 9e, and the hydraulic pressure regulated by the pressure regulating valves 9a to 9e is supplied to each fastening element.

  The pressure regulating valves 9a to 9e are controlled so that the hydraulic pressure of the command pressure set by the electronic control device 13 is supplied to the fastening elements by the solenoids 10a to 10e driven based on the command input from the electronic control device 13. In addition, when the vehicle travels forward, the hydraulic pressure is controlled so that only the fastening elements necessary to obtain a desired gear ratio are supplied.

As shown in FIG. 1, the electronic control unit 13 includes various sensors such as a throttle opening sensor 20, a turbine rotation sensor 21, an oil temperature sensor 22, an output shaft rotation sensor 23, an inhibitor switch 24, an ignition switch 25, and the like. Signal is input.
Also, hydraulic switches 11a to 11e provided in the oil passages 8a to 8e shown in FIG. 3 (turned on when the operating pressure of the corresponding fastening element reaches the pressure at which the piston stroke ends and the fastening capacity starts to be generated. ) Etc. are also input.
Based on these input signals, the electronic control unit 13 calculates the type and timing of the shift, the magnitude of the hydraulic pressure, etc. by a microcomputer, and outputs a command to the solenoids 10a to 10e to control the pressure regulating valves 9a to 9e. It opens and closes and controls the fastening / release of each fastening element.

Control performed by the electronic control unit 13 will be described.
FIG. 4 is a flowchart of control performed by the electronic control unit 13 in the automatic transmission 3 shown in FIG.
In step 101, the electronic control unit 13 confirms whether or not the engine 1 has been started based on a signal input from the ignition switch 25.

  When the start of the engine 1 is confirmed in step 101, in step 102, the electronic control unit 13 determines that the shift lever selection range is the P range position (parking position) or the N range based on the output from the inhibitor switch 24. Check if the position (neutral position). This is for confirming that the operation of the automatic transmission 3 is not started.

  If the selection range of the shift lever is the P range position or the N range position in step 102, the electronic control unit 13 controls the pressure regulating valves 9a to 9e to lock the output shaft 5 of the automatic transmission 3 in step 103. Hydraulic pressure is supplied to the fastening elements of the combination to fasten them. This is to bring the automatic transmission 3 into the interlock state.

If the automatic transmission 3 shown in Figure 1, when stopping the rotation of the front sun gear S _F and the front pinion P _F, the rotation of the rear ring gear R _R, which connects the output shaft 5 through the rear carrier C _R is stopped, The automatic transmission 3 can be brought into an interlock state by locking the output shaft 5.
Therefore, the electronic control unit 13 outputs a drive signal to the solenoids 10a and 10b, supplies hydraulic pressure to the L & R / B and 2-4 / B from the pressure regulating valves 9a and 9b, and fastens these fastening elements. (See FIG. 3). The completion of fastening of these fastening elements is determined based on outputs from the hydraulic switches 11a and 11b.

In step 104, the electronic control unit 13 confirms whether the selected range of the shift lever is the P range position or the N range position.
When the selection of the P range position or the N range position by the shift lever is canceled, the vehicle starts running and the automatic transmission 3 starts to operate. This is because it is necessary to prepare for fastening of a fastening element that is sometimes necessary.

  When the selection range of the shift lever is the P range position or the N range position in step 104, in step 105, the electronic control unit 13 supplies hydraulic pressure to the fastening element having the highest priority among the fastening elements that are not fastened. Let

In this embodiment, the priority of the fastening element that needs to be fastened when starting is set to be the highest, and the fastening element that realizes the low speed stage has a higher priority than the fastening element that realizes the high speed stage. It is set to be.
For example, the priority of each fastening element of the automatic transmission shown in FIG. 1 is the highest priority of L / C that realizes the first speed, and thereafter 2-4 / B and third that realize the second speed. The priority is set lower in the order of H / C for realizing speed, R / C for realizing reverse, and L & R / B (see FIG. 2).
The priority of each fastening element is stored in a storage medium such as a ROM or a memory (not shown) included in the electronic control device 13.

Accordingly, the electronic control unit 13 provides the first speed gear stage in the first step 105 after the L & R / B and 2-4 / B are fastened to bring the automatic transmission 3 into the interlock state. To supply hydraulic pressure.
Specifically, the electronic control unit 13 outputs a drive signal to the solenoid 10c and maintains the pressure regulating valve 9c while maintaining the interlocked state by maintaining the L & R / B and 2-4 / B. The hydraulic pressure is supplied to the L / C and the hydraulic oil is filled in the oil passage 8c to the L / C. Here, the hydraulic pressure supplied to the L / C by the pressure regulating valve 9c is set to a pressure at which the hydraulic oil can be filled in the oil passage 8c, not a pressure for completely fastening the L / C.

  In step 106, the electronic control unit 13 confirms whether or not there is a fastening element that has not yet been supplied with hydraulic pressure among the fastening elements of the automatic transmission 3.

  If there is a fastening element to which no hydraulic pressure is supplied in step 106, the electronic control unit 13 performs the processes of steps 104 and 105 described above until there is no fastening element to which no hydraulic pressure is supplied.

Thereby, the electronic control unit 13 is not supplied with hydraulic pressure according to the priority under the condition that the selection range of the shift lever is the P range position or the N range position and the operation of the automatic transmission 3 is not started. The remaining hydraulic elements are sequentially supplied with hydraulic pressure.
In the present embodiment, since the hydraulic pressure is supplied to the L / C in the above-described step 105, the remaining fastening elements to which no hydraulic pressure is supplied are H / C and R / C. Therefore, the electronic control unit 13 supplies hydraulic pressure to these fastening elements in the order of H / C and R / C according to the priority.

  When the selected range of the shift lever is moved to a selected position other than the P range position or the N range position while the hydraulic pressure is sequentially supplied to the remaining fastening elements to which no hydraulic pressure is supplied, the step is immediately performed. The process proceeds to step 108, and the supply of hydraulic pressure to all the fastening elements to which hydraulic pressure is supplied at that time is stopped.

If there is no fastening element to which no hydraulic pressure is supplied in step 106, in step 107, the electronic control unit 13 confirms whether the selected range of the shift lever is the P range position or the N range position.
While the P range position or the N range position is selected and the operation of the automatic transmission 3 is not started, the fastening elements (L & R / B and 2-4 / B) of the combination that locks the output shaft 5 are maintained. This is because the hydraulic pressure is continuously supplied to all of the remaining fastening elements while maintaining the interlock state, and the supply of the hydraulic pressure to the respective oil passages 8a to 8e is ensured.

If the selected range of the shift lever is not the P range position or the N range position in step 107, in step 108, the electronic control unit 13 stops the supply of hydraulic pressure to the fastening element to which the hydraulic pressure is supplied at that time.
In such a case, since the vehicle starts traveling and the automatic transmission 3 starts to operate, it is necessary to prepare all the fastening elements in the released state and prepare for fastening of the fastening elements required at the time of starting. .

  At this time, the electronic control unit 13 outputs the command pressures to the solenoids 10a to 10e and the timing so that the fastening of the L & R / B and 2-4 / B for locking the rotation of the output shaft 5 is finally released. Adjust. This is because if the fastening of L & R / B and 2-4 / B is released before the supply of hydraulic pressure to the other fastening elements stops, the output shaft 5 may rotate.

As described above, the electronic control device 13 is a combination fastening element that sets the automatic transmission 3 in the interlock state while the selection range of the shift lever is the P range position or the N range position after the engine 1 is started. With the (L & R / B, 2-4 / B) fastened, hydraulic pressure is sequentially supplied to the remaining fastening elements (L / C, H / C, R / C) that are not fastened according to the priority. .
Then, the hydraulic pressure is sequentially supplied to all the remaining fastening elements (L / C, H / C, R / C) excluding the combined fastening elements (L & R / B, 2-4 / B) to be interlocked. When the shift lever selection range is moved from the P range position or the N range position to another selection range and the start of operation of the automatic transmission 3 is determined, all the fastening elements (L & R / B, 2-4 / B, L / C, H / C, and R / C) are continuously supplied with hydraulic pressure.

  As a result, the hydraulic pressure is filled in the oil passages 8 (8a to 8e) for supplying hydraulic pressure to the respective fastening elements before the first shift is started after the engine is started. Sometimes, the hydraulic oil response can be improved by suppressing the amount of hydraulic oil consumed to fill the oil passage.

  Here, the processing of steps 102, 104, and 107 of the present embodiment corresponds to the determination unit in the invention, and the processing of steps 103, 105, 106, and 108 corresponds to the fastening control unit in the invention.

As described above, an automatic system that obtains a plurality of shift speeds by combining and releasing a plurality of fastening elements (L & R / B, 2-4 / B, L / C, H / C, R / C) that are operated by hydraulic pressure. The electronic control unit 13 of the transmission 3 includes a determination unit that determines the start of operation of the automatic transmission 3 based on switching of the shift lever selection range, and oil passages 8a to 8e that supply hydraulic pressure to a plurality of fastening elements. An electronic control unit comprising: a fastening control unit that operates the pressure regulating valves 9a to 9e provided in each of the plurality of fastening elements to adjust the hydraulic pressure supplied to each of the plurality of fastening elements, and fastens and releases the plurality of fastening elements. 13 is a fastening element (L & R / B, 2-4 / B) that is a combination for locking the rotation of the output shaft 5 of the automatic transmission from the start of the engine until the start of operation of the automatic transmission 3 is determined. With the hydraulic pressure supplied to the The remaining fastening elements (L / C, H / C, R / C) are sequentially supplied with hydraulic pressure in the order of priority, and these fastening elements (L / C, H / C, R / C) The hydraulic oil is supplied to the oil passages (8c, 8d, 8e) for supplying hydraulic pressure to the tank.
Thus, before the operation of the automatic transmission is started, the hydraulic pressure is supplied in order from the oil path that supplies the hydraulic pressure to the fastening element having a higher priority among the oil paths that supply the hydraulic pressure to each fastening element. Therefore, the amount of hydraulic oil consumed for filling the oil passage can be suppressed in the first shift performed after the engine is started, so that the hydraulic response in the first shift performed after the engine is started is improved and the shift is performed. Shock can be prevented.
In addition, since the amount of filled oil in the oil passage is stabilized and the stroke time of the piston for fastening the fastening element is stabilized, it is possible to easily set a high-quality shift shock.
Furthermore, while the fastening elements of the combination that brings the automatic transmission 3 into the interlock state are fastened and the rotation of the output shaft 5 is prevented, the pressure regulating valves 9a are supplied so that the hydraulic pressure is supplied to the remaining fastening elements. ˜9e are controlled, the control for preventing the occurrence of a shift shock while suitably preventing the vehicle mounted with the automatic transmission during the control is performed.

Furthermore, it was set as the structure by which the priority of the fastening element fastened at the time of start is set to the highest priority.
Thereby, before the hydraulic pressure is supplied to all of the remaining fastening elements (L / C, H / C, R / C) that are not fastened, the start of operation of the automatic transmission 3 is determined and the control is stopped. However, since the hydraulic pressure is preferentially supplied to the fastening elements that are fastened at the time of starting, it is possible to improve the hydraulic response at the first shift after the engine is started and to prevent the occurrence of a shift shock. Can do.

FIG. 5A is a time chart for explaining ON / OFF of the hydraulic pressure acting on each fastening element when the control shown in FIG. 4 is performed.
Further, as shown in FIG. 5A, the electronic control unit 13 applies hydraulic pressure to the fastening elements (L & R / B, 2-4 / B) that are a combination for locking the rotation of the output shaft 5 of the automatic transmission. In the state of being supplied and fastened, hydraulic pressure is supplied to the remaining fastening elements (L / C, H / C, R / C) that are not fastened in the order of priority, and these fastening elements (L / C C, H / C, and R / C) are filled with hydraulic oil in the oil passages (8c, 8d, and 8e) that supply hydraulic pressure. When the supply of hydraulic pressure to all the fastening elements is completed, the plurality of fastening elements (L & R / B, 2-4 / B, L / C) are determined until the start of the automatic transmission is determined and the end condition is satisfied. , H / C, R / C).
When hydraulic pressure is not supplied to the fastening element, the hydraulic oil supplied from the oil pump side is drained from the pressure regulating valve and does not contribute to filling the oil passage.
By supplying hydraulic pressure to all of the plurality of fastening elements until the start of operation of the automatic transmission is determined, hydraulic oil supplied from the oil pump side can be efficiently used for filling the oil passage. . Therefore, it is possible to improve the hydraulic response in the first shift performed after the engine is started and to prevent the occurrence of a shift shock.

  In the above-described embodiment, the case of an automatic transmission with four forward speeds and one reverse speed has been described as an example. However, the present invention may be applied to other automatic transmissions with different speeds such as an automatic transmission with seven forward speeds and one reverse speed. An automatic transmission can also be suitably implemented.

Moreover, in the said embodiment, as an example when the priority of the fastening element required at the time of start is set the highest, the priority of the fastening element which implement | achieves a low speed stage (1st speed) is the highest, and it is 2nd speed after that. The case where the priority is set to become lower as the fastening element realizing the high speed (fourth speed) is changed from the fastening element realizing the above is shown.
However, the priority setting is not limited to the above form. In general, as a measure for suppressing a shift shock at the time of starting, for example, after first engaging a fastening element that realizes the fifth speed at the time of starting, a fastening element that realizes the first speed is fastened, and thereafter the first speed → second speed → third speed In the case of an automatic transmission that shifts in the order of 4th speed → 5th speed, the priority of the fastening element that realizes the 5th speed is set to the highest priority, and 1st speed → 2nd speed → 3rd speed → 4th speed → reverse In order, the priority of the fastening elements that realize the respective speeds may be lowered.
In addition, since the vehicle may be moved backward immediately after the engine is started, the priority of the fastening element that realizes the first speed and the reverse is set to the highest, and thereafter the priority is increased from the second speed → the third speed → the fourth speed. You may set so that it may become low.

A modification of the control performed by the electronic control device 13 will be described.
FIGS. 5B and 5C are time charts for explaining ON / OFF of the hydraulic pressure acting on each fastening element when the control according to the modification is performed.
In the control according to the first modified example, as shown in FIG. 5B, first, a fastening element (L & R / B, 2-4 /) that is a combination for locking the rotation of the output shaft 5 of the automatic transmission 3 is locked. B) is fastened. And in the state where the fastening of these fastening elements (L & R / B, 2-4 / B) is maintained, the remaining fastening elements (L / C, H / C, R / C) are in order of high priority, The hydraulic pressure is sequentially supplied for a predetermined time T.
When the supply of hydraulic pressure to the remaining fastening elements (L / C, H / C, R / C) excluding the fastening elements that are combined to lock the rotation of the output shaft 5 of the automatic transmission 3 is completed. The sequential supply of hydraulic pressure in the order of priority to these fastening elements (L / C, H / C, R / C) is repeated until it is determined that the operation of the automatic transmission is started.

  In this embodiment, since the priority of each fastening element (L / C, H / C, R / C) decreases in the order of L / C, H / C, R / C, L & R / B, 2- In the state where 4 / B is engaged, the hydraulic pressure is sequentially supplied to these fastening elements (L / C, H / C, R / C) in the order of L / C, H / C, and R / C. It is repeated until it is determined that the machine is in operation.

  In the control according to the second modified example, as shown in FIG. 5C, a fastening element (L & R / B, 2-4 / B) that is a combination for locking the rotation of the output shaft 5 of the automatic transmission 3 is used. When the hydraulic pressure is sequentially supplied to the remaining fastening elements (L / C, H / C, R / C) that are not fastened, and the supply of hydraulic pressure to all fastening elements is completed. The electronic control unit 13 uses these fastening elements for the remaining fastening elements (L / C, H / C, R / C) excluding the fastening elements that are combined to lock the rotation of the output shaft 5 of the automatic transmission 3. (L / C, H / C, R / C) based on the priority of the supply of hydraulic pressure to the fastening elements (L / C, H / C, R / C) whose supply of hydraulic pressure has been stopped The sequential supply of hydraulic pressure is repeated until the start of operation of the automatic transmission is determined.

By engaging and disengaging the fastening element intermittently by the control according to the first and second modified examples so that the hydraulic oil is intermittently taken in and out of the fastening element, Therefore, the hydraulic response to the command pressure is improved.
Such an improvement in the hydraulic response is more suitably exhibited when the temperature of the hydraulic oil is low and the fluidity is poor, or immediately after the engine is started in a cold region, or when the viscosity of the hydraulic oil is high.

In the above embodiment, when the shift lever selection range is the N range position or the P range position, it is determined that the operation of the automatic transmission is not started, and the automatic transmission 3 is in the interlock state.
However, it may be determined whether or not the operation of the automatic transmission is started by further considering the brake ON / OFF, vehicle speed, door open / closed state, and the like.
Since these requirements can be easily determined based on outputs from a brake switch, a vehicle speed sensor, a door sensor, and the like (not shown), they can be suitably used for such determination.

  Furthermore, in the said embodiment, it is fastened in the state which supplied hydraulic pressure to the fastening element (L & R / B, 2-4 / B) used as the combination which locks rotation of the output shaft 5 of an automatic transmission, and was fastened. The remaining fastening elements (L / C, H / C, R / C) are configured to sequentially supply hydraulic pressure in the order of priority, but the remaining fastening elements (L / C, H, which are not fastened) / C, R / C), the oil passages (8c, 8d) that supply hydraulic pressure to the fastening elements (L / C, H / C, R / C) at a time. 8e) may be filled with the hydraulic oil almost simultaneously.

Moreover, in the said embodiment, although the combination of L & R / B and 2-4 / B was illustrated as a combination of the fastening element which locks rotation of the output shaft 5 of an automatic transmission, the fastening element for advance and the object for reverse | retreat The automatic transmission 3 may be in an interlock state by simultaneously fastening the fastening elements.
For example, in the case of an automatic transmission that employs the fastening table shown in FIG. 2, the forward fastening element L / C and the backward fastening element R / C are fastened to bring the automatic transmission 3 into the interlock state. You may make it do.
In this case, when it is determined that the automatic transmission is started, the backward fastening element R / C is released when the vehicle moves forward, and the forward fastening element L / C is released when the vehicle moves backward. The vehicle can be moved forward and backward simply by fastening L & R / B.
At this time, no hydraulic oil is consumed to fill at least the oil passages 8e and 8c to the fastening elements R / C and L / C among the oil passages to the fastening elements that need to be fastened when the vehicle moves forward and backward. Therefore, the hydraulic response immediately after the engine is started is improved, and the occurrence of a shift shock can be suitably prevented.

In addition, when fastening the fastening element for advancing and the fastening element for a retreating simultaneously, all the fastening elements L / C fastened at the time of advancing and fastening elements R / C, L & R / B fastened at the time of a reversing The automatic transmission 3 may be brought into an interlock state by being fastened.
In this case, when the vehicle moves forward, the fastening elements R / C and L & R / B for backward movement are released, and when the vehicle moves backward, only the fastening elements L / C for forward movement are released. This eliminates the need to consume hydraulic oil to fill the oil path to the fastening elements that need to be fastened when the vehicle is moving forward and backward, thus further improving the hydraulic response immediately after the engine is started and generating shift shocks. It can prevent more suitably.

It is a figure which shows the hydraulic control apparatus concerning embodiment. It is a figure which shows the combination of the fastening of a fastening element, and a releasing. It is a figure which shows a hydraulic control apparatus. It is a flowchart explaining the process in a hydraulic control apparatus. It is a time chart which shows ON / OFF of the hydraulic pressure which acts on each fastening element. It is a figure explaining the change of the command pressure in the hydraulic control apparatus concerning a prior art example, an actual pressure, and front-back G.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Torque converter 3 Automatic transmission 4 Input shaft 5 Output shaft 6 Front planetary gear group 7 Rear planetary gear group 8a-8e Oil path 9a-9e Pressure regulating valve 10a-10e Solenoid 11a-11e Hydraulic switch 12 Hydraulic controller 13 Electronic controller 20 Throttle opening sensor 21 Turbine rotation sensor 22 Oil temperature sensor 23 Output shaft rotation sensor 24 Inhibitor switch 25 Ignition switch

Claims (6)

A control device for an automatic transmission that obtains a plurality of shift stages by a combination of fastening and releasing of a plurality of fastening elements operated by hydraulic pressure,
A determination unit for determining the start of operation of the automatic transmission based on switching of the selection range of the shift lever;
By operating a pressure regulating valve provided in each of the oil passages for supplying hydraulic pressure to the plurality of fastening elements, the hydraulic pressure supplied to each of the plurality of fastening elements is adjusted, and the plurality of fastening elements are fastened and released. A fastening control unit,
The fastening control unit supplies hydraulic pressure to a fastening element that is a combination for locking the rotation of the output shaft of the automatic transmission until the start of operation of the automatic transmission is determined from the start of the engine to be fastened. A control device for an automatic transmission, wherein hydraulic pressure is sequentially supplied to remaining fastening elements that are not fastened in descending order of priority.   The fastening control unit fastens the rotation of the output shaft of the automatic transmission by fastening a fastening element fastened when the vehicle starts moving forward and a fastening element fastened when the vehicle goes backward. Item 2. The automatic transmission control device according to Item 1.   3. The control device for an automatic transmission according to claim 1, wherein the priority decreases as the fastening element at the low speed stage changes to the fastening element at the high speed stage. 4.   When the supply of hydraulic pressure to all of the remaining fastening elements that are not fastened is completed, the fastening control unit continues to supply the hydraulic pressure to the plurality of fastening elements until it is determined that the automatic transmission is started. The control device for an automatic transmission according to any one of claims 1 to 3, wherein: When the supply of hydraulic pressure to all of the remaining fastening elements that are not fastened is completed, the fastening control unit,
The automatic supply of the hydraulic pressure to all of the remaining fastening elements that are not fastened, and the sequential resupply of the hydraulic pressure in the order of the highest priority to all of the fastening elements that have stopped the hydraulic pressure supply, 4. The control device for an automatic transmission according to claim 1, wherein the control is repeated until it is determined that the operation of the transmission is started. The sequential supply of hydraulic pressure in the order of high priority with respect to the remaining fastening elements that are not fastened is such that the hydraulic pressure is supplied to the remaining fastening elements that are not fastened in order of high priority at predetermined times. As well as
When the supply of hydraulic pressure to all of the remaining fastening elements that are not fastened is completed, the fastening control unit repeats the sequential supply of the hydraulic pressure until it is determined that the operation of the automatic transmission is started. The control device for an automatic transmission according to any one of claims 1 to 3.

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