JP3480796B2 - Control device for vehicles with automatic transmission - Google Patents

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 a vehicle with an automatic transmission, and more particularly to an improvement of a shift control device capable of switching between an automatic shift mode and a manual mode.

[0002]

2. Description of the Related Art A control device for a vehicle with an automatic transmission adopted in a vehicle includes a shift control controller for controlling the automatic transmission and an engine control controller for controlling the engine. In addition, the torque reduction amount according to the operating state such as throttle opening and engine speed is calculated and sent to the engine control controller, and the engine control controller responds to the torque such as timing retard or fuel injection cut according to the torque reduction amount. It is conventionally known that reduction control is performed to reduce a shock at the time of gear shifting (Japanese Patent Laid-Open No. 7-13).
9381 publication).

In addition, in the automatic transmission, in addition to the automatic shift mode in which the gear stage (gear ratio) is determined in accordance with the operating conditions such as the vehicle speed VSP and the throttle opening TVO (or accelerator opening), a conventional manual transmission is used. As in the case of the variable speed transmission, there are known some types that are provided with a manual mode in which a predetermined gear ratio set in advance is arbitrarily selected according to a gear shift operation of a driver.

[0004]

However, in the former example of the former, the torque down amount is determined at the start of the gear shift, and therefore, when the gear shift operation is performed based on the throttle operation as in the latter automatic gear shift mode. Can smoothly reduce the shift shock, but when the shift operation and the accelerator operation are performed independently as in the latter manual mode, the throttle opening TV
Since O may change, when the output torque of the engine changes, there is a problem that shift shock cannot always be reduced reliably.

Therefore, the present invention has been made in view of the above problems, and in the manual mode of the automatic transmission,
An object of the present invention is to reliably suppress a shift shock even when there is a change in driving operation during a shift.

[0006]

The first aspect of the present invention, as shown in FIG. 5, is an automatic transmission 10 connected to an engine 11.
An engine control means 50 for controlling the engine in accordance with the driving state of the vehicle, and a torque reduction means 5 for reducing the engine torque in response to the start of the shift of the automatic transmission 10.
1 and shift mode switching means 5 for selectively switching between the automatic shift mode and the manual mode of the automatic transmission 10.
2, a shift speed setting means 53 for setting a shift speed according to a driver's operation when the shift mode switching means 52 selects the manual mode, and a request for the torque reduction means 51 according to the start of a shift. In a control device for a vehicle with an automatic transmission, which comprises a torque-down amount calculating means 54 for setting a torque-down amount, the torque-down amount calculating means 5
4 is a target change from the shift start of the automatic transmission when the shift mode switching means 52 selects the manual mode.
Depression amount of the accelerator pedal during shifting until reaching the speed
Depression amount detecting means 57 for detecting the
Set the torque reduction amount according to the increase in the depression amount of
At the same time, during shifting until reaching the target shift speed,
A control device for a vehicle with an automatic transmission, comprising: a torque-down amount updating means 56 for updating the torque-down amount according to a change in the depression amount of the xel pedal .

[0007]

The second invention is based on the first invention.
The torque reduction amount updating unit 56 releases the operation of the torque reduction unit when the depression amount of the accelerator pedal is less than a predetermined value.
Equipped with.

[0009]

Therefore, according to the first aspect of the invention, when the gear shift is performed in the manual mode, the torque reduction amount is updated according to the change of the driving state. , For example, when the accelerator pedal depression amount increases or decreases, the engine output torque also increases or decreases compared to when the shift starts, and when the torque down amount at the start of the shift is maintained, the engine output torque at the end of the shift changes. Although it is not possible to absorb the shift shock, a manual mode shift in which the shift operation and the accelerator operation can be performed independently by updating the torque reduction amount according to the change in the driving state during the shift is in progress. Even in this case, it is possible to always secure the torque reduction amount according to the change of the engine torque during the shift, and it is possible to reliably suppress the shift shock. Kill.

[0010] Then, the second invention, since the to increase the torque down amount in response to an increase of the amount of depression of the accelerator pedal, if depresses the accelerator pedal to select the manual mode during a shift, an increase in the engine torque The slippage of the fastening elements (clutch, brake, etc.) that make up the automatic transmission increases in accordance with the above, and the temperature (oil temperature) of the automatic transmission tries to rise, but the torque reduction amount depends on the depression amount of the accelerator pedal. As compared with the conventional example, it is possible to reduce the slippage that occurs in the fastening element during gear shifting, and it is possible to improve the durability of the automatic transmission.

In the second aspect of the invention , the operation of the torque reducing means is canceled when the accelerator pedal depression amount is less than a predetermined value. Therefore, the accelerator pedal is released during the manual mode shifting. However, if the accelerator pedal depression amount is less than the predetermined value, the operation of the torque reducing means is canceled and the down amount is set to 0, so that shock due to excessive engine braking can be suppressed, and the depression amount during gear shifting is It is also possible to smoothly prevent a shift shock when the number is reduced.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an automatic speed change mode in which a speed change ratio (or a speed change step, the same applies hereinafter) is automatically changed according to a driving state of a vehicle, and an arbitrary speed change ratio can be selected according to a driver's operation. 1 shows an automatic transmission having a manual mode, in which an automatic transmission 10 connected to an engine 11 via a torque converter 12 changes a gear ratio in response to a command from a gear shift control controller 2, and the engine 11 is put into an operating state. Based on the fuel injection amount and the ignition timing determined by the engine controller 1, the engine controller 1 sends the engine speed Ne detected by the engine speed sensor 8 to the shift controller 2 while the engine controller 2 sends the engine speed Ne to the shift controller 2. Torque-down control such as timing retardation or fuel cut according to the torque-down signal Td from It is intended to reduce the shock in speed.

The shift control controller 2 is mainly composed of a microcomputer, and as shown in FIG.
The signal from the selector switch 20 corresponding to the operation of the shift lever 3 operated by the driver is read, and the engine operating speed Ne from the engine control controller 1, the vehicle speed VSP from the vehicle speed sensor 7, the throttle opening, and the like are set as the vehicle operating conditions. The throttle valve opening TVO or the accelerator pedal operation amount (not shown) is read from the speed sensor 6, and in the automatic speed change mode, the gear position (gear position) ratio is determined automatically based on a preset speed change map (shift line). Command the transmission 10.

The storage means (not shown) of the shift control controller 2 stores the shift maps of the automatic shift mode and the manual mode, and the selector switch 20 of the shift lever 3 is used to select these shift modes. 1 has an “H” type gate as shown in FIG. 1, and has an UP switch 4 (“+” in the figure) and a DOWN for performing a manual shift in addition to the “D” range which is an automatic shift mode.
The shift mode is switched from the automatic shift mode to the manual mode by operating the shift lever 3 from the D range position in FIG. 1 to the left side in the figure, which is provided with a switch 5 (“−” in the figure).

In this manual mode, the gear positions are sequentially changed relative to the stroke of the shift lever 3 in the front-rear direction (vertical direction in FIG. 1). When the shift lever 3 is operated to the "+" side, The automatic transmission 10 is instructed to upshift from the current gear, and conversely, when the shift lever 3 is operated to the "-" side, it is instructed to downshift from the current gear.

Next, an example of torque down control in the manual mode performed by the shift control controller 2 is shown in the flowchart of FIG. 2, and will be described in detail with reference to this flowchart. It should be noted that this flowchart is executed each time a gear shift command is generated.

First, when a shift command is issued, step S1
Then, the current shift mode MODE selected by the driver is read from the signal of the selector switch 20, and in FIG.
If the shift lever 3 is in the "D" position, MODE = A because it is the automatic shift mode, and if it is on the "+" or "-" side, it is MODE = M because it is the manual mode in which manual shifting is performed. .

In step S2, the current shift mode MO
It is determined whether the DE is the manual mode M. If the DE is the manual mode (MODE = M), the process proceeds to step S3 and thereafter, while if the automatic shift mode (MODE = A), the process is ended.

Next, in step S3, it is determined whether or not the shift is started. When the shift is started, step S3 is performed.
4, the current throttle opening TVO and engine speed Ne are read.

Then, in step S5, the torque reduction amount Td is calculated from the read throttle opening TVO and the engine speed Ne based on a preset map as shown in FIG.

The map of the torque reduction amount Td is set, for example, such that the torque reduction amount of the engine 11 increases as the throttle opening TVO increases. In FIG. 3, the engine speed Ne is set to a predetermined value. Ne
The throttle opening TVO is a predetermined value TVO in the range of 1 or more.
If 1 or more and less than TVO2, request the engine controller 1 to reduce torque by timing retard,
The torque reduction amount Td at this time is set to S. However, 0/8 and TVO1 <TVO2 <8/8 are set.

Then, the engine speed Ne is a predetermined value Ne.
In a range of 1 or more and the throttle opening TVO is a predetermined value T
When exceeding VO2, in order to further increase the torque reduction amount, the engine control controller 1 is requested to reduce the torque by the fuel cut, and the torque reduction amount Td at this time is requested.
Is set to L.

On the other hand, the torque reduction amount Td is set to 0 because the torque reduction is not required in the regions other than the above.

Next, in step S6, it is determined whether or not the torque reduction amount Td is 0, and if Td = 0, the process proceeds to step S8 to turn off the torque reduction signal to the engine controller 1. On the other hand, if not, the routine proceeds to step S7, where the torque down signal is turned ON and the torque down amount Td is sent out.

Then, in step S9, it is determined whether or not the shift stage k has reached the target shift stage operated by the driver, that is, whether or not the shift is completed. Returns to the process of step S4 again, on the other hand, when the shift is completed, the process proceeds to step S10,
After turning off the torque down signal, the processing is ended.

During the gear shift when the manual mode is selected by the processing of steps S1 to S10, the processing from step S4 to step S9 is repeatedly performed from the gear shift start (step S4) to the gear shift end. , The torque reduction amount Td is updated in accordance with a change in the throttle opening TVO or the engine speed Ne. Therefore, for example, when the engine speed Ne is a predetermined value Ne1 or more and the accelerator pedal is depressed during shifting, =
When TVO1 is increased to TVO2, the torque reduction amount Td is increased from S to L and the engine controller 1
The torque reduction control of No. 2 is switched from timing retard to fuel cut, the torque reduction amount increases, and the torque reduction amount Td increases as the output torque of the engine 11 increases.
The shift shock during gear shifting in the manual mode can be reliably reduced by changing.

That is, the throttle opening TVO during gear shifting
When the shift is increased, the output torque of the engine 11 is increased as compared with the start of the shift, and the torque down amount Td = S at the start of the shift.
However, the shift shock due to the engine output torque at the end of the shift cannot be absorbed, but the shift operation and the accelerator operation are performed independently by updating the torque down amount Td according to the change of the operating state during the shift. Even during the shift in the manual mode, in which it is possible to secure the torque reduction amount according to the change in the engine torque during the shift, it is possible to reliably suppress the shift shock. .

Further, as described above, when the manual mode is selected and the accelerator pedal is depressed during gear shifting, slipping of the fastening elements (clutch, brake, etc.) constituting the automatic transmission 10 in response to an increase in engine torque. Is increased and the temperature (oil temperature) of the automatic transmission 10 is increased, but the torque reduction amount Td is changed according to the throttle opening TVO, so that the fastening element during shifting is changed as compared with the conventional example. The slippage that occurs can be reduced, and the durability of the automatic transmission 10 can be improved.

On the other hand, the throttle opening TVO is T
From the state where it exceeds VO2 and is large, it is fully closed (TVO = 0 /
8) If the throttle opening TVO sharply decreases during the shift, the output torque of the engine 11 decreases sharply compared to the start of the shift, and the torque down amount Td = L at the start of the shift causes the torque to decrease at the end of the shift. Since the engine output torque of is reduced, the engine brake becomes excessive and a shift shock occurs.

Therefore, in the map of FIG. 3, the torque reduction amount Td is set to 0 so as to cancel the torque reduction control in the region where the throttle opening TVO is less than the predetermined value TVO1, so that the throttle opening TVO is rapidly reduced. hand,
By reducing the torque down amount Td from L to 0, the throttle opening TVO is set to the predetermined value TV even if the accelerator pedal is released during the gear shift in the manual mode.
If it is less than O1, the torque down amount Td is set to 0, the torque down control of the engine control controller 1 is stopped, and shock due to excessive engine braking can be suppressed, and the throttle opening TVO is reduced during gear shifting. It is possible to smoothly prevent a shift shock in the case of doing so.

FIG. 4 is a flow chart showing the second embodiment, which is the throttle opening TV shown in the first embodiment.
The update of the torque reduction amount Td when O decreases is omitted, and the torque reduction amount Td is updated only when the throttle opening TVO increases. Other configurations are the same as those of the first embodiment. The same reference numerals are given to the same components.

In FIG. 4, steps S1 to S
4 is the same as above, and after reading the current throttle opening TVO and the engine speed Ne in step S4,
Step S20 is executed.

In step S20, the current throttle opening TVO and the previous throttle opening TVOold are compared, and when the current throttle opening TVO is larger than the previous value TVOold, that is, the accelerator pedal depression amount is increased. Only at this time, the process proceeds to step S5 to calculate the torque reduction amount Td, while the current throttle opening TV
If O is less than or equal to the previous value TVOold, step S21
Then, the process proceeds to and the previous torque reduction amount Tdold is set as the current value Td. It should be noted that TVOold = 0 and Tdold = 0 are set in the first process in which the shift command is issued.

After performing the process of step S21, the process proceeds to steps S6 to S8, the torque down signal is controlled according to the torque down amount Td in the same manner as described above, and then the process proceeds to step S22.

In step S22, the current throttle opening TVO and the torque reduction amount Td are set to the previous value T, respectively.
Substitute for VOold and Tdold, and then, in the same manner as described above, it is determined in step S9 that the shift is completed.

If the shift has been completed, the process returns to step S4 again, and the current throttle opening TVO and the previous value TVOol
While the torque down amount Td is set based on d, when the shift is completed, the process proceeds to step S23, the torque down signal is turned off, and the previous value TVOold is set.
And Tdold are each reset to 0, and the process ends.

Therefore, during shifting, the throttle opening T
Since the torque down amount Td is updated only when VO has increased more than the previous value TVOold, the increase in the throttle opening TVO during the shift can be detected more rapidly than in the first embodiment. Therefore, as described above, it is possible to reduce the number of fastening elements in real time when the manual mode is selected and the accelerator pedal is depressed during shifting, and the durability of the automatic transmission 10 can be further improved. It will be possible.

In the above embodiment, the map of the torque reduction amount Td shown in FIG.
Is set to a predetermined value Ne1 or more and the throttle opening TVO is set to a predetermined value TVO2 or more, only the fuel injection cut is performed. However, although not shown, timing retard may be performed in addition to the fuel injection cut. Alternatively, the timing retard may be performed in addition to the fuel injection cut when the engine speed Ne exceeds the predetermined value Ne2 (> Ne1).

In the above embodiment, an example in which the UP switch 4 and the DOWN switch 5 in the manual mode are operated according to the displacement of the shift lever 3 has been shown, but although not shown, these switches are used for the steering wheel and the steering column. Alternatively, it can be placed on an instrument panel or the like.

[Brief description of drawings]

FIG. 1 is a block diagram of a vehicle with automatic transmission showing an embodiment of the present invention.

FIG. 2 is a flowchart showing an example of torque down control in a manual mode performed by a shift control controller.

FIG. 3 is a map of a torque reduction amount Td.

FIG. 4 is a flowchart showing an example of torque down control in a manual mode performed by a shift control controller according to the second embodiment.

FIG. 5 is a claim correspondence diagram corresponding to any one of the first to third inventions.

[Explanation of symbols]

1 Engine control controller 2 Shift control controller 3 shift lever 4 UP switch 5 DOWN switch 6 Throttle opening sensor 7 vehicle speed sensor 8 Engine speed sensor 10 automatic transmission 11 engine 20 selector switch 50 engine control means 51 Torque reduction means 52 Gear shift mode switching means 53 Gear position setting means 54 Torque reduction amount calculation means 55 Operating state change amount detection means 56 Torque reduction amount updating means 57 Depression amount detection means 58 Torque reduction canceling means

Continuation of front page (56) Reference JP-A-1-257731 (JP, A) JP-A-6-147076 (JP, A) JP-A-3-265752 (JP, A) JP-A-9-144581 (JP , A) JP-A-2-45626 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 41/00-41/28 F02D 29/00 F02D 41 / 00- 41/40

Claims (2)

(57) [Claims] 1. An automatic transmission connected to an engine, engine control means for controlling the engine according to a driving state of a vehicle, and torque reduction for reducing engine torque in response to the start of a shift of the automatic transmission. Means, a shift mode switching means for selectively switching between an automatic shift mode and a manual mode of the automatic transmission, and when the shift mode switching means selects the manual mode, a shift speed is set according to a driver's operation. A control device for a vehicle with an automatic transmission, comprising: a shift speed setting means for setting; and a torque down amount calculating means for setting a torque down amount required for the torque reducing means in response to start of a shift. The means shifts from the shift start of the automatic transmission to the target shift speed when the shift mode switching means selects the manual mode.
The amount of depression of the accelerator pedal during gear shifting up to
Depression amount detection means and torque reduction amount according to the accelerator pedal depression amount
Setting and shifting until reaching the target gear
A control device for a vehicle with an automatic transmission, comprising: a torque down amount updating means for updating the torque down amount in accordance with a change in the accelerator pedal depression amount . 2. The torque down amount updating means is configured to
If the amount of depression of the cell pedal is less than the specified value,
The control device for a vehicle with an automatic transmission according to claim 1, further comprising a torque reduction canceling unit that cancels the operation of the torque reducing unit.