JP2001082596A - Controller for automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for an automatic transmission which can reduce select lag without deteriorating shock reduction effect in foreward running, and prevent increasing of select shock when the select position is shifted from a neutral position to a reverse position. SOLUTION: A control device for an automatic transmission has a manually operated valve 8 for sensing a select position, a starting frictional fastening element circuit 6 for fastening a foreward clutch 1 when the position selected by the manually operated valve 8 is a running position, and an ND accumulator 12 which can control starting operation of hydraulic pressure at the time of fastening. An accumulator control valve 15 has a changeover position so as to make a port 22 on the back pressure side of an accumulator with a drain port 24 and to change over control of accumulator supplying pressure to a neutral state, when the select position sensed by the manually operated valve 8 is changed over from the neutral position to a reverse position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art As a conventional control device for an automatic transmission of a vehicle, for example, a control device as shown in FIGS. 8 to 10 is known (see Japanese Patent Application Laid-Open No. 1-1050510).

In such a vehicle, an ND accumulator 2 for a forward clutch 1 is provided to prevent ND select shock.

The ND accumulator 2 mainly accommodates a stepped accumulator piston 3 slidably in a corresponding stepped cylinder 4 and urges the accumulator piston 3 to a large diameter side by a spring 5. ing.

[0005] The accumulator piston 3 has a large-diameter end face 3a on which a fastening pressure P of the starting friction element circuit 6 is applied.
In addition to the action of F, the accumulator supply pressure PA guided from the accumulator control valve 7 is applied to the stepped surface 3b so as to act in the same direction as the spring 5.

The ND accumulator 2 has a back pressure PA
As the pressure rises, an accumulator characteristic in which the fastening pressure PF rises sharply is exhibited.

For this reason, when the manual valve 8 is switched from the state in the N range to the D range, the back pressure PA is temporarily increased by driving the duty solenoid 9 for a predetermined time.

In this control device, the starting frictional element circuit 6 is precharged to increase the engagement pressure PF at an early stage without impairing the effect of reducing the select shock, as shown in FIG. As shown in the figure, the rising characteristics of the transmission output torque TQ and the transmission input rotation speed N (from selection to torque rising, b = 0.34 seconds) can be improved.

In particular, even at a time when the viscosity of the hydraulic oil is low (extremely low), the selection delay can be reduced without delaying the application of the hydraulic pressure to the starting friction element circuit 6.

FIG. 9A shows the accumulator piston 3 when the precharge is not performed for comparison.
The rise characteristics (a = 0.75 seconds from selection to torque rise) affected by the time lag caused by the strokes of FIG.

[0011]

However, in such a conventional control apparatus for an automatic transmission of a vehicle, in order to reduce the number of parts, the accumulator used for the overrun clutch 10 for 4-speed engagement is provided by NR. Also serves as an NR accumulator 12 for a reverse clutch 11 provided to prevent select shock.

The NR accumulator 12 mainly includes:
A stepped accumulator piston 13 is slidably housed in a corresponding stepped cylinder 14, and the accumulator piston 13 is urged toward a small diameter 13c by a spring 13f.

The accumulator piston 13 has:
An engagement pressure PO of the overrun clutch 10 or the like is applied to the large-diameter side end surface 13a so as to act in the same direction as the spring 13f, and an accumulator supplied from the accumulator control valve 7 is applied to the stepped surface 13b. The pressure PA is configured to be applied.
A reverse clutch 1 is provided on the end face on the small diameter 13c side.
A reverse clutch circuit 13d communicating with the first clutch 1 is connected.

Therefore, when the manual valve 8 is switched from the N range to the R range, as in the case of the 3-4 shift, the accumulator supply pressure PA is changed to the stepped surface 1.
8b, the accumulator piston 13 is pushed down against the urging force of the spring 13f as shown in the right side position in FIG. The state (part C in FIG. 10B) is reached.

In such a state, as shown in FIG. 10B, the transmission output torque TQ value (about 13 k) when the precharge shown in FIG.
gm), a large T
There is a problem that a Q value (about 14.4 kgm) is generated and the select shock when switching the NR range is deteriorated.

Accordingly, an object of the present invention is to solve the above-mentioned problems, reduce the select lag without impairing the effect of reducing the select shock at the time of forward movement, and furthermore, when selecting from a neutral position to a reverse position. An object of the present invention is to provide a control device for an automatic transmission that can prevent deterioration of a select shock.

[0017]

According to the first aspect of the present invention, there is provided a selector device for switching a vehicle driving state between forward running, stopping, and reverse running by switching a shift lever. Select position detecting means for detecting at least a forward, stop, reverse selection position, a starting frictional engagement element to be engaged when the selected position by the select position detection means becomes a forward travel position,
In the process of switching the starting frictional engagement element from non-engagement to engagement, the starting frictional engagement element accumulator capable of controlling the transient hydraulic pressure to the starting frictional engagement element by the accumulator supply pressure, and selecting by the select position detecting means. A reverse frictional engagement element that is engaged when the position is set to the reverse travel position, and a transient hydraulic pressure applied to the starting frictional engagement element in the process of switching the reverse frictional engagement element from non-engagement to engagement. The friction detected by the select position detecting means is controlled by a common hydraulic circuit that controls the reverse friction engagement element accumulator and the accumulator supply pressure to the starting friction engagement element accumulator and the reverse friction element accumulator. When the position is switched to the neutral position and from the neutral position to the forward position A control device for an automatic transmission, comprising: an accumulator control unit for controlling a transient hydraulic pressure, wherein the accumulator control unit changes a select position detected by the select position detection unit from a neutral position to a reverse position. The automatic transmission control device is configured to switch the control of the accumulator supply pressure to an interrupted state when the switching is performed.

According to the present invention, the accumulator is controlled by the accumulator control means when the select position detected by the select position detecting means is switched from a neutral position to a reverse position. The control of the supply pressure is switched to the interrupted state.

According to the second aspect of the present invention, the accumulator control means includes an accumulator control valve, and the accumulator control valve controls the accumulator supply pressure to be interrupted by draining the accumulator supply port. The control device for an automatic transmission according to claim 1, which is performed by communicating with a port.

According to the second aspect of the present invention, when the select position detecting means detects that the shift lever of the select device is in the neutral position, the accumulator control valve sets the accumulator supply port. Is communicated with the drain port to interrupt the control of the accumulator supply pressure and regulate the accumulator supply pressure.

For example, even if a pre-charge is performed to reduce the select lag when the shift lever is switched from the neutral position to the forward position, the select position detecting means can determine whether the shift lever is in the neutral position. When detecting that the position has been switched from the reverse position to the reverse position, regardless of the accumulator supply pressure in the neutral position,
By controlling the accumulator supply side port to communicate with the drain port, the control of the accumulator supply pressure is interrupted.

For this reason, even if the reverse friction fastening element accumulator is precharged, the precharge is interrupted with the switching of the shift lever, and the shelf is in a standing state, and is shifted from the neutral position to the reverse position. Deterioration of select shock at the time of selection is prevented.

According to a third aspect of the present invention, there is provided the automatic transmission control device according to the first aspect, further comprising holding means for holding the accumulator back pressure side port at a switching position for communicating with the drain port. I have.

According to the third aspect of the present invention, the holding means holds the switching position at which the accumulator back pressure side port communicates with the drain port, so that the holding means is used, for example, at a neutral position for starting. Even if the back pressure of the ND accumulator is increased, in the R range selected state, the back pressure of the NR accumulator is released to the drain port and the shelf can be held.

Further, according to the present invention, the holding means is guided by a manual valve to apply an R range pressure to a side end face of a valve body slidably provided in the accumulator control valve. The control device for an automatic transmission according to claim 2, further comprising an R range pressure applying circuit for applying the pressure.

[0026] According to the present invention, the R range pressure is adjusted by the R range pressure applying circuit.
The accumulator control valve is provided on the side end surface of the valve body and positions the valve body at a switching position where the accumulator back pressure side port and the drain port communicate with each other.

For this reason, when switching from the neutral position to the forward state, the back pressure of the ND accumulator is increased to a desired pressure, precharge is performed, the select lag is reduced, and the neutral position is shifted from the reverse position to the reverse position. When selecting the NR accumulator, the back pressure of the NR accumulator is released to the drain port to prevent the deterioration of the select shock.

According to the fifth aspect of the present invention, a slidable accumulator piston is provided on the reverse friction fastening element accumulator, and the accumulator piston is moved in a direction opposite to a direction in which the accumulator supply pressure is applied. And a transient hydraulic pressure from the reverse friction engagement element in the same direction as the accumulator supply pressure is applied.In the accumulator control valve, the accumulator supply pressure side port is connected to the drain port. By communicating, the supply pressure to the reverse friction fastening element accumulator is released, the control of the accumulator piston is interrupted, and only the transient hydraulic pressure is opposed to the urging force of the urging means, and Select shock of friction fastening element can be mitigated Is characterized in the control device for an automatic transmission according to claim 2 or 4, wherein that.

According to the fifth aspect of the present invention, the control of the accumulator piston is interrupted,
Since only the transient hydraulic pressure is opposed to the urging force of the urging means, a sufficient stroke can be secured,
You can have a fence.

According to the present invention, the reverse friction fastening element accumulator is provided with a slidable accumulator piston, and the forward gear is provided in a direction opposed to a hydraulic pressure supplied from the accumulator control means. The control device for an automatic transmission according to any one of claims 1 to 5, wherein a transient hydraulic pressure of the frictional engagement element for gear shifting is applied, and the supplied hydraulic pressure is used as an accumulator back pressure.

According to the sixth aspect of the present invention, when the transient hydraulic pressure of the frictional engagement element for the forward gear is applied in a direction opposite to the hydraulic pressure supplied from the accumulator control means, the speed of the forward gear is changed. As the accumulator back pressure, the supply hydraulic pressure can be used, the select lug is reduced without impairing the effect of reducing the select shock, and the forward friction fastening element accumulator and the reverse friction fastening element accumulator are also used. An increase in the number of parts can be suppressed.

[0032]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 8 show a first embodiment of the present invention.
It shows. Parts that are the same as or equivalent to those in the conventional example will be described with the same reference numerals.

First, in the control device of the automatic transmission according to the first embodiment, in order to prevent ND select shock, the select position is set to the running position and the forward clutch is used as the starting frictional engagement element. 1 is provided with an ND accumulator 2 as a starting frictional engagement element accumulator capable of controlling the transient hydraulic pressure applied to the forward clutch 1.

In the ND accumulator 2, mainly,
A stepped accumulator piston 3 is slidably housed in a corresponding stepped cylinder 4, and the accumulator piston 3 is urged to a large diameter side by a spring 5.

The accumulator piston 3 has, on its large-diameter end surface 3a, a fastening pressure PF of a starting friction element circuit 6 which constitutes a starting friction element together with a high clutch 6b and the like.
Is actuated, and the accumulator supply pressure P is guided from the accumulator control valve 7 to the stepped surface 3b so as to act in the same direction as the spring 5.
A back pressure supply circuit 13e for applying A is connected.

The ND accumulator 2 has a back pressure PA
When the manual valve 8 as a select position detecting means for detecting the select position is switched from the state in the N range to the D range in order to obtain an accumulator characteristic in which the fastening pressure PF rises rapidly as By driving the duty solenoid 9 for a predetermined time, the back pressure PA is temporarily increased. The manual valve 8 is connected to a shift select device as a select device that switches a vehicle driving state between forward running, stopping, and reverse running by switching a shift lever (not shown).

In the first embodiment, the accumulator used for the overrun clutch 10 for the fourth speed engagement is also used as the NR accumulator 12 for the reverse clutch 11 provided for preventing NR select shock. This suppresses an increase in the number of parts.

In the NR accumulator 12, a stepped accumulator piston 13 is mainly slidably housed in a corresponding stepped cylinder 14, and an urging force for urging the accumulator piston 13 toward the small diameter 13c. A spring 13f is provided as a means. In the first embodiment, the elastic force of the spring 13f is set to be larger than the elastic force of the spring 5 of the ND accumulator 2.

The accumulator piston 13 has:
The large-diameter end surface 13a is acted upon by the engagement pressure PO of the overrun clutch 10 or the like so as to act in the same direction as the spring 13f. And the accumulator supply pressure PA is applied through the back pressure supply circuit 13e.

The accumulator piston 1
3, the reverse clutch 11 is provided on the end face on the small diameter 13c side.
And a reverse clutch circuit 13d communicating with the reverse clutch circuit 13d.

The accumulator control valve 15 as accumulator control means has a valve body 17 provided slidably in a substantially cylindrical sleeve 16. A line pressure port 20 facing the sleeve 16 faces one end face 17a of the valve body 17 such that a line pressure circuit 19 connected to the duty solenoid 18 and supplying the throttle pressure Pth faces.
And a throttle port 21.

Further, the back pressure supply circuit 1 is arranged in parallel with the sleeve 16 from the throttle port 21 side.
An accumulator back pressure side port 22 and a back pressure feedback port 23 connected to 3e are formed.

These accumulator back pressure side ports 2
A drain port 24 is formed between the second and back pressure feedback ports 23. A line circuit 25 for supplying a line pressure to the ND accumulator 2 and the NR accumulator 12 is connected to a side opposite to the drain port 23 with the accumulator back pressure side port 22 interposed therebetween, and a line pressure supply port 26 is formed. I have.

When the valve body 17 slides within the sleeve 16 to change its position, the accumulator back pressure side port 22 communicates with the drain port 24 as shown in FIG. The control of the supply pressure is switched to an interrupted state, the accumulator back pressure side port 22 is closed as shown in FIG. 4, and the back pressure supply circuit 13e is closed, or as shown in FIG. Back pressure side port 2
2 is connected to the line pressure supply port 26.

Further, in the first embodiment, the other end face 17b of the valve body 17 faces the R range pressure action chamber 27 as a holding means formed at one end of the sleeve 16. I have. In this R range pressure action chamber 27,
An R range pressure application circuit 28 for supplying an R range pressure from the manual valve 8 is connected to an R range pressure port 29.
Has been faced.

In the R range pressure action chamber 27, a half groove 27a is formed on the side surface of the R range pressure port 29 opposite to the sleeve, and the R range pressure port 29 is formed.
, A side force escape portion 27b is formed.

The accumulator control valve 15 is provided with an opposing spring 17c for applying an R-range opposing pressure from one end face 17a of the valve body 17 toward the other end face 17b by an urging force. It is housed in contact with the one end face 17a via a member 17d and a plunger 17e.

When the manual valve 8 is in the neutral position, as shown in FIG. 3, the accumulator back pressure side port 22 of the accumulator control valve 15 is in a switching position in which the port 22 communicates with the drain port 24. As described above, the R range pressure is supplied to the R range pressure applying circuit 28 so as to balance with the throttle pressure Pth acting on one side end face 17a of the valve body 17 from the throttle port 21.

Next, the operation of the first embodiment will be described.

In the control device for the automatic transmission according to the first embodiment, when the manual valve 8 is in the neutral position, the throttle pressure Pth supplied from the line pressure circuit 19 into the line pressure port 20 is low. The pressure in the R range pressure action chamber 27 is relatively high. Therefore, as shown in FIG. 3, the valve body 17 is slid to the left in FIG. 3, and the accumulator control valve 15 is moved to the accumulator back pressure side port 22.
And the drain port 24.

For this reason, the NR accumulator 12
The back pressure is released from the drain port 24 via the back pressure supply circuit 13e shown in FIG. 1, and the shelf is standing even if the select position of the manual shift 8 is switched from the neutral position to the reverse position. It becomes possible to reduce the select shock.

For example, as shown in FIG. 7, when the select position is switched from the neutral position to the reverse position, the torque fluctuation width TQd is about 13.1 kgm, and FIG.
The conventional torque fluctuation width T without the precharge shown in FIG.
It is almost the same as Qd = 13.0 kgm. At this time, in the first embodiment, since the elastic force of the spring 13f of the NR accumulator 12 is set to be larger than the elastic force of the spring 5 of the ND accumulator 2, the reverse clutch 11 Can be concluded.

Even if the select position is switched from the neutral position to the reverse position, the R range pressure applying circuit 28
However, the R range pressure supplied from the manual valve 8 is applied to the R range pressure working chamber 27 to oppose the throttle pressure Pth.

For this reason, as shown in FIG. 2, the valve main body 17 of the accumulator control valve 15 changes the switching position to the accumulator back pressure side port 22.
For example, even if the back pressure of the ND accumulator 2 used for starting increases at the neutral position, the R
In the range selection state, the oil in the stepped cylinder that is pressed and discharged by the stepped surface 13b by the urging force of the spring 13f of the NR accumulator 12 is:
Back pressure supply circuit 13e, accumulator back pressure side port 2
2 and drained completely through the drain port 24,
As shown in the left side position in FIG. 1, the small diameter side 13c of the NR accumulator 12 is brought close to or in contact with the upper surface portion,
The back pressure of the NR accumulator 12 is reliably released to the drain port 24, and the control of the accumulator supply pressure is
The ND accumulator 2 and the NR accumulator 1
In both cases, the state is interrupted.

Therefore, in the NR accumulator 12, the stroke of the reverse clutch 11 viewed from the reverse clutch circuit 13d side can be sufficiently secured, and the shelf can be held.

For this reason, it is not necessary to consider the influence on the shift shock generated by switching to the R range selection state. When the vehicle starts moving forward, the back pressure of the ND accumulator 2 is maintained at a desired value, and The friction element circuit 6 is precharged, and the fastening pressure PF is increased at an early stage, so that the rising characteristics can be improved.

For example, if the duty solenoid 18 is controlled to temporarily increase the throttle pressure Pth, the throttle pressure P supplied from the line pressure circuit 19 to the line pressure port 20 or the throttle port 21 is controlled.
th is high, and is supplied to the R-range pressure action chamber 27 through the R-range port 29 through the R-range pressure applying circuit 28.
Internal pressure can be reduced. As a result, as shown in FIG. 5, the valve body 17 is slid to the right in the drawing, and the accumulator control valve 15 is connected to the accumulator back pressure side port 22.
Then, the valve main body 17 is slid and moved to a valve position for communicating with the line circuit 25.

For this reason, the NR accumulator 12
A high pressure line pressure PL is applied to the stepped surface 3b of the accumulator piston 3 in the inside, and the large-diameter side end surface 3a is moved to the vicinity of the bottom surface of the stepped cylinder 4 as shown on the right side in FIG. Can be done.

Therefore, the starting friction elements such as the forward clutch 1 can be more easily precharged via the starting friction element circuit 6, and the transmission output torque is increased as shown in FIG. It is possible to improve the rising characteristics of the TQ and the transmission input rotation speed N.

After the vehicle starts moving forward, as shown in FIG.
R range pressure Pr supplied from the manual valve 8
In the accumulator control valve 15, the accumulator back pressure side port 22 is closed by the valve body 17 by acting on the R range pressure action chamber 27 and maintaining the balance against the throttle pressure Pth. Is held at the position For this reason, there is no fear that the clutch engagement pressure PF supplied to the forward friction element circuit 6 having the forward friction element such as the forward clutch 1 is lost, and a desired clutch engagement pressure PF is obtained.

As described above, in the control device for the automatic transmission according to the first embodiment, the R range pressure is applied by the R range pressure applying circuit 28 to the other end face 17b of the valve body 17 of the accumulator control valve 15. The valve body 17 is positioned at a switching position where the accumulator back pressure side port 22 and the drain port 24 communicate with each other.

In particular, in the reverse position, the back pressure of the NR accumulator 12 is released from the drain port 24, and the accumulator piston 13 is connected to the small-diameter portion 13c by the stepped cylinder 14 as shown on the left side in FIG.
A sufficient stroke to receive the pressure in the reverse clutch circuit 13d connected to the reverse clutch 11 can be secured.

Therefore, in this control device, a neutral pressure is applied to the ND accumulator 2 connected to the back pressure side of the NR accumulator 12 in accordance with the rise of the throttle pressure Pth, and the starting friction element circuit 6 is precharged. In particular, even at very low temperatures where the viscosity of the hydraulic oil is low,
Without delaying the application of hydraulic pressure to the starting frictional element circuit 6, the engagement pressure PF is increased early, and the transmission output torque is increased as shown in FIG. Rise characteristics of TQ and transmission input rotation speed N (b = from select to torque rise)
About 0.34 seconds).

Further, in the control device for the automatic transmission according to the first embodiment, the existing NR accumulator 12 can be used as the 3-4 speed accumulator for reducing the select shock of the overrun clutch 10. . That is, at the time of the 3-4th speed change, the throttle pressure Pth is relatively high, and the back pressure side supply circuit 1
The state shown in FIG. 5 or the pressure adjustment state shown in FIG. 4 in which the line pressure PL is supplied to 3e is configured.

For this reason, the NR accumulator 12
As shown in a right side position in FIG. 1, the large-diameter side end surface 13a is brought close to or in contact with the bottom surface portion against the urging force of the spring 13, and is connected to the overrun clutch 10. The stroke for receiving the pressure oil on the overrun clutch circuit 10a side is sufficiently ensured, and the shelf can be formed.

Accordingly, it is possible to suppress an increase in the number of parts and to reduce the complexity of the configuration.

Although the first embodiment of the present invention has been described in detail with reference to the drawings, the specific structure is not limited to the first embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. Even this is included in the present invention.

For example, in the first embodiment, the R range pressure is applied to the one end face 17a of the valve body 17 of the accumulator control valve 15 by using the R range pressure applying circuit 28 as the holding means. Although not particularly limited to this, for example,
When the duty solenoid 18 is controlled to shift from the neutral state to the R range selection state, the valve body 17
When switching from the neutral position to the reverse position, for example, by adjusting the throttle pressure Pth so that the accumulator back pressure side port 22 and the drain port 24 communicate with each other, the accumulator control valve 15 is connected to the accumulator. Back pressure side port 2
Any configuration may be used as long as 2 is a switching position for communicating with the drain port 24.

[0070]

As described above, according to the first aspect of the present invention, the select position detected by the select position detecting means is switched from the neutral position to the reverse position by the accumulator control means. At this time, the control of the accumulator supply pressure is switched to an interrupted state.

According to the second aspect of the present invention, when the select position detecting means detects that the shift lever of the select device is in the neutral position, the accumulator control valve drains the accumulator supply port. By communicating with the port, the control of the accumulator supply pressure is interrupted, and the accumulator supply pressure is adjusted.

For example, even if pre-charging is performed to reduce the select lag when the shift lever is switched from the neutral position to the forward position, the select position detecting means can determine whether the shift lever is in the neutral position. When detecting that the position has been switched from the reverse position to the reverse position, regardless of the accumulator supply pressure in the neutral position,
By controlling the accumulator supply side port to communicate with the drain port, the control of the accumulator supply pressure is interrupted.

For this reason, even if the reverse frictional engagement element accumulator is precharged, the precharge is interrupted with the switching of the shift lever, and the shelf is in a standing state, and is shifted from the neutral position to the reverse position. Deterioration of select shock at the time of selection is prevented.

According to the third aspect of the present invention, since the holding means holds the switching position at which the accumulator back pressure side port communicates with the drain port, for example, the ND accumulator used for starting at the neutral position Even if the back pressure is increased, in the R range selected state,
The back pressure of the NR accumulator is released to the drain port and the shelf can be held.

Further, according to the fourth aspect, R
The range pressure is applied to the side end surface of the valve body of the accumulator control valve by the R range pressure applying circuit, and the valve body is positioned at a switching position where the accumulator back pressure side port and the drain port communicate with each other.

Therefore, when switching from the neutral position to the forward state, the back pressure of the ND accumulator is increased to a desired pressure, precharge is performed, the select lag is reduced, and the neutral position is changed to the reverse position. When selecting the NR accumulator, the back pressure of the NR accumulator is released to the drain port to prevent the deterioration of the select shock.

According to the fifth aspect of the present invention, since the control of the accumulator piston is interrupted and only the transient hydraulic pressure is opposed to the urging force of the urging means, a sufficient stroke is secured. You can have a shelf.

According to the sixth aspect of the present invention, the transient hydraulic pressure of the forward speed shifting frictional engagement element is applied in a direction opposite to the hydraulic pressure supplied from the accumulator control means, so that the accumulator at the time of forward speed shifting is provided. As the back pressure, the supply hydraulic pressure can be used, the select lug is reduced without impairing the effect of reducing the select shock, and the number of parts is reduced by using both the forward friction fastening element accumulator and the reverse friction fastening element accumulator. Can be suppressed, and a practically useful effect can be exhibited.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating an overall configuration of a control device for an automatic transmission according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the accumulator control valve used in the control device for the automatic transmission according to the first embodiment, showing a valve switching position in an R range selection state along a valve body sliding direction.

FIG. 3 is an accumulator control valve used in the control device of the automatic transmission according to the first embodiment, which is mainly along a sliding direction of a valve body showing a valve switching position in a neutral state and a state in which a throttle pressure Pth is the smallest It is sectional drawing in a position.

FIG. 4 is a cross-sectional view of the accumulator control valve used in the control device for the automatic transmission according to the first embodiment, showing a valve switching position during pressure adjustment in a forward movement state and along a valve body sliding direction. It is.

FIG. 5 is a cross-sectional view of the accumulator control valve used in the control device for the automatic transmission according to the first embodiment, showing a valve switching position in a state where the throttle pressure Pth is the highest and along the valve body sliding direction. It is.

FIG. 6 is a hydraulic circuit diagram schematically showing connection of each starting friction element in the control device for the automatic transmission according to the first embodiment.

FIG. 7 is a graph showing a change in transmission output torque TQ when shift selection is shifted from a neutral state to an R range selection state in the control device for the automatic transmission according to the first embodiment.

FIG. 8 is a circuit diagram illustrating an overall configuration of the control device for the automatic transmission.

FIG. 9 shows a select lag when the shift select is shifted from the neutral state to the forward state by the control device of the automatic transmission. FIG. 9 (a) shows a lag a when precharge is not performed; FIG. 4B is a graph illustrating a lag b when precharging is performed.

FIG. 10 is a control device of the automatic transmission, showing a change in transmission output torque TQ when shift selection is shifted from a neutral state to an R range selection state, and FIG. FIG. 4 is a graph illustrating a torque fluctuation value TQd when no precharge is performed, and FIG. 4B is a graph illustrating a torque fluctuation value TQd when a precharge is performed. It is a perspective view of the principal part explaining the pillar antenna attachment part structure of other conventional examples.

[Explanation of symbols]

Reference Signs List 1 forward clutch 6 starting friction element circuit (starting friction element) 8 manual valve (select detection device) 11 reverse clutch 12 ND accumulator 15 accumulator control valve (accumulator control means) 28 R range pressure applying circuit (holding means)

Claims (6)

[Claims] 1. A selection device for switching a vehicle driving state between forward traveling, stop, and reverse traveling by switching a shift lever, select position detecting means for detecting at least forward, stop, and reverse select positions, and the select position detecting means. The starting frictional engagement element that is engaged when the select position at the forward traveling position is set, and in the process of switching from the non-engagement to the engagement state, the transient hydraulic pressure to the starting frictional engagement element. A starting frictional engagement element that can be controlled by an accumulator supply pressure; an accumulator; a reverse frictional engagement element that is engaged when the select position of the select position detection unit is a reverse travel position; and a reverse frictional engagement element. In the process of switching from non-engagement to engagement, the transient hydraulic pressure to the starting frictional engagement element can be controlled by the accumulator supply pressure By controlling the accumulator supply pressure to the starting frictional engagement element accumulator and the starting frictional engagement element accumulator and the reverse frictional element accumulator by a common hydraulic circuit, the select position detected by the select position detecting means becomes neutral. And an accumulator control means for controlling a transient oil pressure when the position is switched from the neutral position to the forward position, wherein the accumulator control means comprises The control device for an automatic transmission, characterized in that the control of the accumulator supply pressure is switched to an interrupted state when the select position detected in (1) is switched from the neutral position to the reverse position. 2. The accumulator control means has an accumulator control valve, and in the accumulator control valve, control of the accumulator supply pressure is interrupted by connecting an accumulator supply side port to a drain port. The control device for an automatic transmission according to claim 1, wherein 3. A control device for an automatic transmission according to claim 1, further comprising a holding means for holding said interrupted state. 4. An R-range pressure applying circuit for applying an R-range pressure to a side end face of a valve body slidably provided in the accumulator control valve, the holding means being guided from a manual valve. The control device for an automatic transmission according to claim 3, wherein: 5. The accumulator for reverse frictional fastening element includes a slidable accumulator piston, and biasing means for biasing the accumulator piston in a direction opposite to a direction in which the accumulator supply pressure is applied. And applying a transient hydraulic pressure from the reverse friction engagement element in the same direction as the direction in which the accumulator supply pressure is applied. In the accumulator control valve, the accumulator supply pressure side port communicates with the drain port to thereby perform the reverse friction engagement. The supply pressure to the element accumulator is released, the control of the accumulator piston is interrupted, and only the transient oil pressure is opposed to the urging force of the urging means, so that the select shock of the reverse friction engagement element can be reduced. 5. The method according to claim 2, wherein: Control device for automatic transmission. 6. An accumulator for slidably moving the reverse frictional engagement element, wherein a slidable accumulator piston is provided to apply a transient hydraulic pressure of the forward gear change frictional engagement element in a direction opposite to a hydraulic pressure supplied from the accumulator control means. 6. The control device for an automatic transmission according to claim 1, wherein the supply hydraulic pressure is used as an accumulator back pressure.