JP3036528B1 - Shift control device for automatic transmission with manual shift range - Google Patents

Abstract

The present invention avoids the problem of heat generation due to a jump upshift when switching from D to M range and re-stepping on during a foot release upshift. SOLUTION: A foot release 1 → 4 shift command instant t ₁ to 1 →
4 If the re-depression of the accelerator pedal instantly t ₃ with performed over the shift time switch from instant t ₂ to the D range during shifting to M range is made, the command gear position GP
_NEXT remains at the 4th speed because the gear position for the manual transmission range is still used at the instant D → M range switching instant t ₂ ,
The re-depression instant t ₃ Alternatively, in order to command the gear position GP _NEXT automatic transmission range gear position determined from the downshift line for the D range, the GP _NEXT in time across the downshift line The gear position sequentially changes to the third gear, the second gear, and the first gear to the lower gear position. However, the command gear position GP
The change in _NEXT is not reflected in the actual shift due to a shift response delay, and the automatic transmission is maintained at the first speed as apparent from the time series change of the currently selected gear position GP _NOW , and does not generate a jump shift.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control device for an automatic transmission having a manual shift range, and more particularly, to a manual shift range during a foot-releasing upshift caused by releasing the accelerator pedal in the automatic shifting range. The present invention relates to a shift control device for switching and depressing an accelerator pedal again.

[0002]

2. Description of the Related Art Automatic transmissions are known, for example, from Nissan Motor Co., Ltd.
Issued in March 1987, "NISSAN RE4R
01A Full-range electronically controlled automatic transmission maintenance manual "(A261C07), automatic shift range of a manual valve operated by a driver using a shift lever (usually referred to as D range).
In the above, the power transmission path (gear position) of the gear transmission system is determined by selectively hydraulically operating (fastening) a plurality of friction elements such as a clutch and a brake, and the selected gear position moves from the input shaft to the output shaft. Power transmission is possible, and shifting to another gear position is performed by switching the operating friction element. Today, automatic transmissions are used to selectively hydraulically actuate a plurality of friction elements.
It is customary to perform this by electronic control by a controller, and the controller determines when the commanded gear position obtained from the operating state does not match the selected gear position.
By outputting a shift command to the command gear position to a shift solenoid or the like, the corresponding friction element is engaged.

In recent years, a shift lever (manual valve) is set to a manual shift range (usually referred to as an M range) position so that a manual shift can be performed even though the shift is an automatic transmission. However, each time the driver tilts the shift lever to the upshift position in the manual shift range, the commanded gear position is increased by one step based on the selected gear position when switching to the manual shift range. Upshifting is possible sequentially, and conversely, each time the driver tilts the shift lever to the downshifting position, the commanded gear position is shifted one step at a low speed on the basis of the selected gear position when switching to the manual shift range. An automatic transmission capable of sequentially downshifting is disclosed in
No. 3,310,019.

[0004]

Here, when determining the above-mentioned command gear position in the automatic shift (D) range, a predetermined shift pattern illustrated in FIG. 3A (a solid line is an upshift shift line, Is the downshift shift line)
Based on the engine throttle opening TVO and the vehicle speed V
The command gear position is obtained from the running conditions specified by SP.
On the other hand, in the manual shift (M) range, as shown in FIG. 3 (b), the fourth speed permitted area is illustrated by a 3 ← 4 downshift shift line, although the vehicle speed range is limited, the manual shift from the automatic shift (D) range is performed. (M) The command gear position is sequentially changed by manual operation based on the selected gear position when switching to the range.

[0005] Therefore, the automatic transmission (D) range, the first
Release the accelerator pedal while driving at high speed,
(A) As shown by α, when the throttle release TVO is reduced, the accelerator pedal is depressed again when the up-shift 1 → 4 upshift is to be performed. Considering the case of returning to the first speed selection area, the speed change command is 1 → 4 → 3 → 2 → 1 speed change command, but the actual speed change is such that the first speed is maintained due to a response delay. Even if the shift occurs, there will be no intermittent shift via the fourth or third speed, and at most the second
The first speed is reached via the speed. Therefore, as long as the automatic shift (D) range is maintained, even if the accelerator pedal is depressed again greatly by the accelerator pedal operation, the friction element for shifting does not generate excessive heat.

However, during traveling in the automatic shift (D) range and the first speed, a foot release 1 → 4 upshift due to a change in traveling conditions indicated by α in FIG. 3A is about to be performed. At the same time, the automatic shift (D) range is switched to the manual shift (M) range, and the accelerator pedal is depressed again to set the throttle opening TVO with the same reference β in FIG. 3 (b) as described above with reference to FIG. 3 (a). If returned to the original opening as shown, the manual shift (M) is a range because release command gear position GP _NEXT feet as shown in FIG. 6 1 → 4 upshift command instant t ₁ after, D → is maintained to the M selecting operation instant t ₂ and the accelerator pedal again depression instant t ₃ even 4-speed selection as is evident from the change of the gear position GP _{the NOW,} eventually 1 → 4 upshift from being performed. However, since the 1 → 4 upshift is a jumping upshift with a large change in gear ratio, and since the rotational energy is large at a high throttle opening with the accelerator pedal depressed greatly, the upshift is not possible. The frictional element generates heat intensely, which significantly deteriorates the durability of the automatic transmission.

To solve this problem, an automatic transmission (D)
When switching to the manual shift (M) range during shifting in the range, the start of the manual shift (M) mode is delayed until the shift ends, and during this time, the same shift as not performing the D → M select operation is performed. Can be executed. However, in this measure, the indicator does not indicate that the M range is being selected even if the D → M selection operation is performed, the display of the selected gear position to be displayed during the M range selection is delayed, or the D → M selection is performed.
It has been confirmed that even if an upshift operation or a downshift operation is performed immediately after the M-select operation, a corresponding shift is not performed, and it is not practical because of a sense of incongruity.

In the first aspect of the present invention, the durability problem due to the heat generation occurs when the jump upshift has a large change in the gear ratio. In view of the fact that the problem of heat generation can be solved, an object of the present invention is to propose a shift control device of an automatic transmission with a manual shift range that embodies this idea and can solve the problem of heat generation. .

According to a second aspect of the present invention, it is possible to simultaneously determine whether or not the accelerator pedal is depressed again and determine a gear position for preventing a jump upshift. Thus, an object of the present invention is to propose an automatic transmission with a manual shift range that can easily achieve the operation and effect of the first invention.

[0010]

SUMMARY OF THE INVENTION For these purposes, first, the shift control device for an automatic transmission with a manual shift range according to the first invention has a manual shift range in addition to the automatic shift range. In the manual shift range, the shift control is performed so that the command gear position is manually determined based on the currently selected gear position when switching to the range. When the automatic transmission is switched to the manual transmission range and the accelerator pedal is depressed again during the jump upshift that is caused by releasing the accelerator pedal in the automatic transmission range,
The present invention is characterized in that a jump upshift is not generated.

According to a second aspect of the present invention, there is provided a shift control device for an automatic transmission with a manual shift range according to the first aspect, wherein when the jump upshift is commanded, the gear being selected when switching to the manual shift range is selected. The position and the gear position obtained based on the shift pattern for the automatic shift range are compared, and if the gear position for switching the manual shift range is a gear position higher than the gear position for the automatic shift range, the manual shift range is determined. However, by setting the gear position for the automatic shift range as the command gear position, the jump upshift is prevented from occurring.

[0012]

According to the present invention, the automatic transmission is controlled to shift to a command gear position determined based on a predetermined shift pattern in the automatic shift range, and the manual shift range is being selected when switching from the automatic shift range to the manual shift range. The automatic transmission is controlled to shift to a command gear position manually determined with reference to the gear position.

The shift control device according to the first invention is
Shift to the manual transmission range during jump upshifting caused by releasing the accelerator pedal in the automatic shift range and shift control of the automatic transmission so that jumping upshifting does not occur when the accelerator pedal is depressed again. Therefore, by performing a shift other than the jump upshift, it is possible to perform a shift corresponding to immediately switching to the manual shift range and immediately depressing the accelerator pedal without delaying the shift in the manual shift range. The heat generation can be started immediately, and the heat generation problem does not occur because the shift is not a jump upshift.

Since the shift in the manual shift range is immediately started without delay as described above, the indicator does not indicate that the manual shift range is being selected even if the manual shift range is switched, or the manual shift range is being selected. It is possible to eliminate the uncomfortable feeling that the display of the selected gear position to be displayed is delayed or that the shift corresponding to the manual upshift operation or downshift operation immediately after switching to the manual shift range is not performed.

In the second invention, when the jump upshift is not commanded as in the first invention, when the jump upshift is commanded, the gear position being selected at the time of switching to the manual shift range is selected. And the gear position determined based on the shift pattern for the automatic shift range, and if the gear position for switching the manual shift range is a gear position on the higher speed side than the gear position for the automatic shift range, the manual shift range is also determined. By setting the gear position for the automatic transmission range as the command gear position so that the jump upshift is not generated, it is determined whether or not the accelerator pedal is depressed again, and the jump upshift is not generated. The gear position can be determined at the same time, and the operation and effect of the first invention can be easily achieved. Rukoto can.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a shift control device of an automatic transmission with a manual shift (M) range according to an embodiment of the present invention, wherein 1 is an engine, 2 is a torque converter,
Denotes an automatic transmission, and engine rotation is transmitted to an input shaft 4 of the automatic transmission via a torque converter 2.

The automatic transmission 3 is basically the same as that described in the aforementioned "RE4R01A Automatic Transmission Maintenance Manual" (A261C07) issued by Nissan Motor Co., Ltd. A front planetary gear set 6 and a rear planetary gear set 7 are mounted on the shafts 4 and 5. The forward clutch F / C, high clutch H / C, band brake B / B, low reverse brake LR / B, low one-way clutch L / OWC,
And a reverse clutch R / C, which can selectively select a forward first to fourth gear position and a reverse gear position.

In the present embodiment, in order to execute the selective operation (fastening) of the friction element, the automatic transmission 3 is used.
The shift solenoids 9 and 10 are provided in the control valve 8 of the control valve 8.
A lock-up solenoid 11 is inserted and provided for lock-up control of the torque converter 2. The automatic transmission 3 turns on and off the shift solenoids 9 and 10.
The first forward speed corresponding to the four combinations of F
Friction elements F / C, H / C, B /
B, shall be selectively engaged.

The low reverse brake LR / B and the reverse clutch R / C allow the driver to shift the shift lever 15 (described later) to the engine brake (L) range position, the manual shift (M) range position, and the reverse travel ( R) When the range position is set, the operation hydraulic pressure is supplied from a port of a manual valve (not shown) interlocked with the range position, the operation hydraulic pressure is supplied, the engagement is performed as predetermined, the engine can be braked in the first speed, and the reverse gear position is set. Shall be selectable.

The lock-up solenoid 11 is turned on.
, The lock-up clutch of the torque converter 2 is fastened to bring the torque converter 2 into a lock-up state in which the input / output elements are directly connected, and OFF turns off the lock-up clutch to bring the torque converter 2 into the converter state. .

The ON / OFF of the solenoids 9 to 11 is performed by a controller 14, and the controller includes:
A signal from a selector switch 16 for detecting a selection range selected by the driver using the shift lever 15, a manual shift command generated by the driver using the shift lever 15, and a throttle for detecting the throttle opening TVO of the engine 1. The signal from the opening sensor 17 and the vehicle speed VS
A signal from a vehicle speed sensor 18 that detects P and a signal from an idle switch 19 that is turned on when the accelerator pedal is released are input.

The supplementary explanation of the shift lever 15 and the selector switch 16 is as follows. The shift lever 15 has a well-known parking (P) range position as described in the above-mentioned document.
Reverse (R) range position, neutral (N) range position, automatic forward shifting (D) range position, and engine brake (L) range position (same as the one described in the above literature). Are arranged on a straight line,
It has a newly added manual shift (M) range position offset from the straight line.

The selector switch 16 is connected to the shift lever 1
It is assumed that a signal indicating which of the range positions is operated by the controller 5 is output to the controller 14. While the shift lever 15 is in the manual shift (M) range position, it is supported in a self-returning manner between an upshift (+) position and a downshift (-) position. The shift lever 15 is operated to the upshift (+) position each time the upshift to the step higher speed is desired, and the shift lever 15 is downshifted (-) each time the downshift to the one step lower speed is desired. When the shift lever 15 is moved to the upshift (+) position or the downshift (-) position, the selector switch 16 is manually operated for the upshift or downshift. A shift signal is output to the controller 14.

The controller 14 executes the control program shown in FIG. 2 for a predetermined time from the release gear shift command based on the above input information, and executes the following gear shift control. First, in step 21, it is determined whether or not there has been a switch from the automatic shift (D) range to the manual shift (M) range during a foot release upshift that is caused by releasing the accelerator pedal in the automatic shift (D) range. Check. In cases other than the above, since the problem of the heat generation to be solved by the present invention does not occur, the control proceeds to step 22,
Here, the throttle opening TVO and the vehicle speed V are determined based on a map for each selected range including the D range shift map of FIG. 3A and the M range fourth speed region map of FIG.
The command gear position GP _NEXT is obtained from the SP as usual. In the M range, each time the shift lever 15 is moved to the upshift (+) position or the downshift (-) position with respect to the gear position at the time of switching to the range, the upshift from the selector switch 16 is performed. In response to the shift manual shift signal or the downshift manual shift signal, the command gear position GP _NEXT is sequentially changed to the high-speed side or the low-speed side by one step.

If the condition of step 21 is satisfied, it is checked in step 23 whether the above-mentioned foot-release upshift is a jump upshift which causes the problem of heat generation to be solved by the present invention. If it is not a jump upshift, step 22 is executed to determine the command gear position GP _NEXT as usual.

In the case of a jump upshift, in step 24, the gear is switched to the manual shift (M) range, and the command gear position (the gear position normally selected when switching to the M range) GP _NEXT (M) is obtained. In step 25, the automatic shift range gear position GP _NEXT (D) is determined based on the downshift line shown by the broken line in the shift line pattern for the D range illustrated in FIG. Next, in step 26, the gear position GP _NEXT (M) for manual shift range switching and the gear position GP _NEXT (D) for automatic shift range are compared, and the former gear position GP _NEXT for manual shift range switching is compared. If (M) is a gear position on the higher speed side than the latter automatic shift range gear position GP _NEXT (D), the automatic shift range gear position GP _NEXT (D) is changed to the lower gear position by depressing the accelerator pedal again. it means that the transition to the position, resulting in the problem of heat generation by the present invention is to solve, since become jump upshift accompanying re depression of the accelerator pedal, the original in manual shift range in step 27 GP _NEXT
Automatic transmission range gear position GP _NEXT instead of (M) (D)
Is the command gear position GP _NEXT .

When it is determined in step 26 that the gear position GP _NEXT (M) for manual shift range switching is not a gear position higher than the gear position GP _NEXT (D) for automatic shift range, the present invention is applied. Because it is not a jump upshift that causes the problem of heat generation to be solved,
The control proceeds to a step 22, wherein the command gear position GP _NEXT is obtained as usual.

At step 22 or 27, the command gear position G
After determining P _NEXT , the command gear position GP _NEXT is compared with the currently selected gear position GP _NOW in step 28, and if they match, the shift solenoids 9 and 10 are turned on and off in step 29. The current selected gear position GP _NOW is maintained without being changed, and if they do not match, the shift solenoids 9 and 10 are switched ON and OFF so that the shift to the command gear position GP _NEXT is executed in step 30.

According to the present embodiment, in steps 21 and 23, it is determined that the D → M range has been switched during the jump upshift which is caused by releasing the accelerator pedal in the D range. ,
If it is determined in steps 24 to 26 that the shift to the M range has been performed and the accelerator pedal has been immediately depressed again as described above, the jumping upshift which causes the problem of heat generation to be solved by the present invention is determined to be step 27. In the M range, the gear position GP _NEXT (D) for the automatic transmission range obtained from the downshift line for the D range is replaced by the command gear position GP instead of the gear position GP _NEXT (M) for switching the manual transmission range in the M range. _{Since NEXT} contributes to the shift control, it is possible to avoid the occurrence of the jump upshift when the D → M range is switched and the stepping on is performed again. As described above, while the speed-changing friction element generates intense heat, Kill is possible to avoid.

In order to solve the problem, instead of delaying the shift in the M range, the shift in the M range can be immediately started immediately after switching as described above, and the problem can be solved. Even when the range is switched, the indicator does not indicate that the M range is being selected, the display of the selected gear position to be displayed during the selection of the M range is delayed, or a manual upshift or downshift operation is performed immediately after switching to the M range. It is possible to eliminate a sense of incongruity that a corresponding shift is not performed when there is.

In order to prevent the jump upshift from occurring as described above, the gear position GP _NEXT (M) for manual shift range switching is set to the gear for the automatic shift range obtained from the downshift shift line for the D range. Position G
If it is determined that the gear position is on the higher speed side than P _NEXT (D), the gear position GP for manual shift range switching is determined.
_{Instead of NEXT} (M), the gear position GP _NEXT (D) for the automatic transmission range obtained from the downshift line for the D range is used as the command gear position GP _NEXT so that the jump upshift is not performed. It is possible to simultaneously determine whether or not re-depressing has been performed and determine the gear position for preventing the jump upshift from occurring, thereby easily achieving the above operation and effect. .

The above operation and effect are switched from the D range to the M range during the 1 to 4 upshift, which is caused by the release of the accelerator pedal as indicated by α in FIG. FIG. 3 (b) showing the 4th speed permitted area
The case where the accelerator pedal is depressed again to return the throttle opening TVO to the original opening as indicated by β above will be described below with reference to FIG. An idle switch 19 in FIG. 1, becomes ON until instant t ₂ depressing again the release instant t ₁ of the accelerator pedal of Figure 4, the command gear position GP _NEXT to release instant t ₁ of the accelerator pedal becomes the fourth speed 1 → A 4-shift command is issued.

[0033] Although the shift to the corresponding over the release 1 → 4 shift time foot from the foot release 1 → 4 shift command instant t ₁ is carried out, instant t ₂ of 1 → 4 in the up-shift and release the foot as described above When the accelerator range is changed from the D range to the M range at the same time and the accelerator pedal indicated by β in FIG. 3B is depressed again at the instant t ₃ , the command gear position GP _NEXT becomes D → M.
Since the gear position GP _NEXT (M) for manual shift range switching is still used at the range switching instant t ₂ , FIG.
Although the (b) remains as apparent fourth speed, the re-depression instant t ₃ instead of the GP _NEXT (M), the automatic transmission range gear GP determined from the downshift characteristic curve for the D range for use _NEXT and (D) as a command gear position GP _NEXT, command gear position GP _NEXT third speed whenever crossing the downshift line, the second speed is changed to sequentially lower speed gear position to the first speed. Thus, the change in the command gear position GP _NEXT is not reflected in the actual shift due to a shift response delay, but is kept at the first speed as is apparent from the time series change of the currently selected gear position GP _NOW. 6, it is possible to avoid a situation in which the jump 1 → 4 upshift as described above with reference to FIG. 6 occurs and the heat generation of the friction element increases.

In this embodiment, as shown in FIG. 2, at step 26, even if there is a D → M range change during the D-range upshift, the gear position GP for manual shift range change is performed. _{When it is determined that NEXT} (M) is not a gear position higher than the automatic transmission range gear position GP _NEXT (D) determined from the downshift line for the D range, that is, it is determined that the accelerator pedal is not depressed again. If so, the control proceeds to step 22 to determine the command gear position GP _NEXT as usual. That is, each time the shift lever 15 in FIG. 1 is shifted to the upshift (+) position or the downshift (−) position with reference to the gear position at the time of switching to the M range, the upshift from the selector switch 16 is performed. In response to the manual shift signal or the downshift manual shift signal, the command gear position GP _NEXT is sequentially changed one step at a time to the high speed side or the low speed side.

As a result, as shown in FIG.
A 3 upshift command is issued at the instant t ₁ , the switch to the M range is made at the instant t ₂ while the corresponding 1 → 3 shift is performed, and the driver releases the foot at the instant t ₃ with the foot released. upshift (+) manual shift command or downshift (-) to explained if there is a manual shift command, the command gear position GP _NEXT upshifts instantaneously t ₃ (+) manual shift command or downshift (-) In response to the manual shift command, the speed is changed one step higher or lower. Therefore, if the foot release state without re-stepping on remains, as is clear from the time series change of the currently selected gear position GP _NOW , the upshift (+) manual operation before the completion of the foot release 1 → 3 upshift is completed. A shift command or a downshift (-) manual shift command can be executed to enable shifting from the first speed to, for example, the fourth speed or the second speed, and the heat generation described above can be performed without sacrificing the manual shift. Can solve the problem.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a shift control device of an automatic transmission with a manual shift range according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a shift control program executed by a controller in the embodiment.

3A is a region diagram illustrating a shift pattern for a D range in the automatic transmission, and FIG. 3B is a region diagram illustrating a permitted region of an M range fourth speed in the automatic transmission. It is.

FIG. 4 shows a shift control operation of the embodiment when the D → M range is changed and the accelerator pedal is depressed again during a foot release upshift, as a time-series change of a command gear position and a selected gear position. It is a time chart.

FIG. 5 shows the shift control operation of the embodiment when the D → M range is switched during the foot release upshift and a manual shift command is issued while the foot is released, and the shift control operation of the command gear position and the selected gear position is described. It is a time chart shown as a time series change.

FIG. 6 is a time chart corresponding to FIG. 4 showing a shift control operation of a conventional automatic transmission with a manual shift range as a time-series change of a command gear position and a selected gear position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Torque converter 3 Automatic transmission 4 Input shaft 5 Output shaft 6 Front planetary gear set 7 Rear planetary gear set 8 Control valve 9 Shift solenoid 10 Shift solenoid 11 Lock-up solenoid 14 Controller 15 Shift lever 16 Selector switch 17 Throttle opening sensor 18 Vehicle speed sensor 19 Idle switch

Claims (2)

(57) [Claims] 1. A manual shift range is provided in addition to an automatic shift range. In the automatic shift range, shift control is performed so that a commanded gear position is obtained based on a predetermined shift pattern. In the manual shift range, switching to the range is performed. In an automatic transmission that is controlled so that the command gear position is manually determined based on the currently selected gear position, a jump upshift caused by releasing the accelerator pedal in the automatic transmission range is performed. A shift control device for an automatic transmission with a manual shift range, wherein a jump upshift is not generated when the shift to the manual shift range and the accelerator pedal is depressed again. 2. The gear position according to claim 1, wherein when the jump upshift is commanded, a gear position being selected when switching to the manual shift range and a gear position determined based on a shift pattern for an automatic shift range. And compare
If the gear position for manual shift range switching is a gear position on the higher side than the automatic shift range gear position, the jump upshift shift can be performed by setting the automatic shift range gear position to the command gear position in the manual shift range. A shift control device for an automatic transmission with a manual shift range, wherein the shift control device does not generate the shift.