JP3380113B2 - Transmission control device for 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 shift control for an automatic transmission.
Regarding the control device, in addition to the usual shift characteristics,
Gear shifting characteristics that apply only in certain operating conditions
The present invention relates to a shift control device. [0002] 2. Description of the Related Art Conventionally, an engine speed is higher than a predetermined value.
In the deceleration operation state, the fuel supply to the engine is
Electronically controlled fuel injection with so-called deceleration fuel cut to stop
Devices are known. On the other hand, the deceleration fuel cut is performed.
In automatic transmissions connected to the engine
During operation, the engine speed at which the deceleration fuel cut is performed
The function of controlling the gear position so that it is higher than
A shift control device having a shift control for deceleration) has been proposed.
(See JP-A-4-203559). [0003] By the way, a vehicle for a vehicle
In a dynamic transmission, generally, a selector operated by a driver is used.
The range can be selected with the lever.
The selectable ranges include, for example, P, R, N,
There are D, 3, 2, and 1 ranges. Here, "3"
When the gear is selected, is it among first gear, second gear, and third gear?
The gear position is selected from the
For example, the engine speed at which the fuel cut can be executed at the third speed
If the rotational speed is ensured, the deceleration shift control
Thus, the third speed is controlled. And this state
The driver operates the select lever to select between 1st gear and 4th gear.
When changing to the "D" range where automatic shifting is performed by
Normally, the conditions for upshifting to 4th gear are
However, at the 4th speed, the engine speed can be reduced
If not, it will be held in third gear
(See FIG. 5). [0004] The "D" range from the "3" range by the driver
In general, the driver performs an upshift
Can be regarded as requiring
Is the highest stage where a fuel cut can be performed as described above.
The driver responds to an upshift request while shifting.
Even if the range change operation is performed,
If the shift is not performed and the driver feels strange
There was a problem. [0005] The present invention has been made in view of the above problems.
Yes, the driver's intention for shifting even during deceleration shifting control
Gear shifting control that reflects the
Target. [0006] For this purpose, the present invention is described in claim 1.
The present invention is configured as shown in FIG. Figure 1
In this case, the normal shift control means is configured to execute a predetermined shift pattern.
The shift of the automatic transmission is controlled according to the following. Also,Variable for deceleration
The speed control means controls the engine in the deceleration operation state of the engine.
The fuel supply is stopped by the fuel cut means.
Automatically changes to be higher than the specified engine speed.
Controls gear shifting. Here, the operation priority means includes:The deceleration shift
During gear shifting control by the control means, the driver selects a higher gear.
When performing an operation to instruct the change to the selected range
The speed selected by the deceleration speed control means.
In accordance with the range change instruction, the regular shift control
When the gear to be selected in the gear is a higher gear,
Forcibly return to the normal speed change control means, and
The gear is higher than the gear selected by the gear shift control means.
Selected by the regular shift control means in accordance with the change instruction.
When the desired gear should be lower or the same
The speed change control by the speed reduction speed control means is continued.
You.According to such a configuration,A deceleration fuel cut is performed
When shifting control is performed to obtain the engine speed
Even if it was, the driver requested an upshift
In the case of an upshift where the engine speed decreases
This is done even if there is
To reflect. [0008] [0009] [0010] [0011] [0012] [0013] [0014] Embodiments of the present invention will be described below.
I do. In FIG. 2 showing the system configuration of the embodiment,
The automatic transmission 2 is connected to the engine 1. The automatic change
To control the hydraulic pressure to the various speed change elements of the transmission 2
The control unit 10 is connected to the solenoid valves 2A to 2E.
Outputs a control signal, which controls the shifting operation.
Is done. On the other hand, a slot is provided in the intake passage of the engine 1.
The opening degree θ of the
The idle switch 3A that is turned on when the torque valve is fully closed
Including throttle sensor 3 and intake air flow rate of engine 1
An air flow meter 4 for detecting Q is provided. Also,
Detect engine speed N by distributor etc.
A rotation sensor (crank angle sensor) 5 is provided. Ma
A vehicle speed sensor 6 for detecting a vehicle speed VSP, an automatic transmission 2
A gear position sensor 7 for detecting the gear position (gear position) of the
Be killed. In addition, it turns ON when the foot brake is activated
Brake switch 8, A / T select operated by driver
Inhibitor switch that detects the selection range by lever
A switch 9 is provided. Note that the A / T select lever allows
For example, of each range of P, R, N, D, 3, 2, 1
Either one can be arbitrarily selected. Previous
The detection signals from various sensors and switches are controlled by
Input to the unit 10. Control unit 10
Is the detection result of the intake air flow rate Q and the engine speed N.
Controlling the fuel supply amount to the engine 1 based on the result
The throttle valve is fully closed (idle switch 3A is
N) and the engine speed N (rpm) is equal to the set speed N _CLess than
In the deceleration operation state above, stop the fuel supply (this
Function corresponds to the deceleration fuel cut means), the set rotation speed
Degree N_RA so-called deceleration fuel tank that restarts fuel supply when
Control. The control unit 10 is usually
Is the vehicle speed VSP and the throttle valve opening θ (accelerator opening)
Gear shift control according to a gear shift pattern set in advance based on
Control (this function is equivalent to regular shift control means)
However, during a predetermined deceleration operation (specific operation state),
Instead of the normal shift control, the deceleration fuel cut control
Set rotation speed N_C Keeping the engine speed above
Control gear shifting to facilitate execution of deceleration fuel cut
Deceleration shift control is performed.
NohFor decelerationGear shift control means).
The shift control is performed according to the flowcharts of FIGS.
Will be explained. In the flowchart of FIG.
In step 1 (indicated as S1 in the figure, the same applies hereinafter)
Determines ON / OFF of the idle switch 3A.
Predetermined deceleration operation on condition that the idle switch 3A is ON
If it is in the inverted state, the process proceeds to step 2. In addition, predetermined
If the idle switch 3A is ON,
Alternatively, the brake switch 8 may be turned on. Step 2 is a step for canceling deceleration shift control.
The flag F indicating the cell state is determined. The flag
Indicates that the idle switch 3A is OFF in step 1.
Is determined, that is, it is not in the predetermined deceleration operation state
When the normal gear shifting control is performed, the
Step 3 resets to 0
After step 3, the process proceeds to step 4, and the vehicle speed VSP and the speed are normally set.
Transmission control (ordinary transmission control) in accordance with the opening angle of the
Done. The function of this step 4 is the normal shift control means.
Is equivalent to Therefore, in the first shift to deceleration operation,
Is determined in step 2 that the flag F is 0.
Then, the process proceeds to the deceleration shift control in step S5. S
Step 5 deceleration shift control (For decelerationTransmission control means)
The child is shown in detail in the flowchart of FIG. FIG.
In the flowchart of FIG.
The engine when the gear position G is controlled to 4th speed from the operation state
Rotation speed N_Four Is calculated by the following equation. However, the current situation is 4
N for fast_Four = N
The same applies to steps 54 and 57). N_Four= VSP K1 I_Four・ E Where K1 is the vehicle speed VSP (km / h) and the output shaft of the transmission.
Constant for converting to the rotation speed (rpm) of I_FourIs 4 speed
Gear ratio (also I_Three, I_Two, I₁Are 3rd, 2nd, 1st respectively
E indicates a torque converter)
Speed ratio (assuming constant). Then, the program proceeds to a step 52, wherein a fourth speed prediction engine is executed.
Gin rotation speed N_FourIn the deceleration fuel cut control
Set rotation speed N_CCompare with And N_Four≧ N_CIn
If it is determined that the
The gear position G when performing the speed control is determined to be the fourth speed, and_X=
I_FourAnd set. On the other hand, at step 52, N_Four<N_CAnd judgment
When it is determined, the process proceeds to step 54, where the same arithmetic expression
 (I_FourTo I_Three3 speed prediction engine
Rotation speed N _Three, And then proceeds to step 55 where N_ThreeTo
N_CCompare with And N_Three≧ N_CIs determined to be
To proceed to step 56 in the same manner as above,
The gear position G for performing control is determined to be 3rd speed, and I_X= I
_ThreeAnd set N_Three<N_CIf it is determined that
Proceed to step 57. Hereinafter, the same applies in steps 57 to 62.
Predicted engine speed N_Two, N₁Seeking moderating fuel
Set rotation speed N for cut control_CAnd N_Two≧ N_C,
N₁≧ N_CWhen it is determined that_X= I_Two, I_X
= I₁And set. Also, N₁<N_CIs determined,
Depending on the shift control, the set rotation speed N _CAbove
Since it is not possible, the routine proceeds to step 4 and the normal shift
Execute shift control according to the pattern (normal shift control means)
You. In this way, when shifting sequentially from the gear position on the high-speed side,
Predict the engine speed and N_CHighest among the above
The gear position on the high speed side is determined as the gear position for speed reduction control.
To step 63. In step 63, the gear position is changed to the determined gear position.
Calculate the deceleration when speeding up. This is the vehicle speed after shifting
VSP_X (VSP_X= K2 · I_X・ N_X: K2 is a constant)
Is calculated as the deviation ΔVSP from the current vehicle speed VSP.
I will. In step 64, the deviation ΔVSP is compared with a predetermined value.
If the speed is larger than the predetermined value,
The deceleration by the engine brake becomes too large.
Judgment that the gear shift is felt, stop the shift and proceed to step 4.
Then, normal shift control (normal shift control) is performed. On the other hand, in step 64, the deviation ΔVSP is
If it is determined that the following is satisfied, the process proceeds to step 65, where the determination is made.
Gear position I_XSpeed control. Shift control for deceleration
The engine rotation speed N is set as described above during deceleration operation.
Rotation speed N_CIs the gear position selected so that
The opportunity for a deceleration fuel cut to increase
Cost performance can be improved. Step 51 above
The function of step 65 corresponds to the deceleration shift control means. Here, returning to the flowchart of FIG.
To continue the description, the flowchart of FIG.
When the deceleration shift control is executed by
The speed has been shifted to the third speed as a result of the speed reduction control.
Is determined. And when it is 3rd speed,
Proceed to step 7 and the driver operates the A / T select lever
To select a range that indicates an upshift request (for regular control)
Operation to instruct to change the shift characteristics in
Is determined. Selection of the range indicating the upshift request
The selection means, for example, that the shift is controlled in the first to third speeds.
Shift control is performed from 1st to 4th speed from "3" range
Higher speed gear is selected as in operation to the "D" range
Shall indicate the change to the range to be performed. In step 7, the upshift request is indicated.
If a range is selected, go to step 8.
4th gear is selected by normal shift control in the changed range.
Conditions (vehicle speed and throttle valve opening)
Determine. Then, in the case of normal control, the speed is changed to the fourth speed.
If it is under the condition, proceed to step 9 and
Corresponds to the A / T select lever rather than shift control
Upshift to 4th gear is compulsory, giving priority to shift control
To run. Therefore, the upshift to the fourth speed
Therefore, the engine in which the deceleration fuel cut is stopped
Even when the rotation speed reaches N, the A / T select lever
Upshift to 4th gear in response to
It is necessary to shift gears that reflect the driver's intention.
Can be. That is, by maintaining the third speed, the deceleration fuel
If cutting can be executed, "3"
Even if the operation is changed from the
It is required to be normal, but generally from the "3" range
To shift to the "D" range, upshift from 3rd gear to 4th gear
The shift operation is
Upshift to 4th gear, which is a higher gear, by shifting control
No upshift to 4th gear under conditions
This gives the driver a feeling of strangeness. Therefore, during the deceleration shift control, the driver
Operate the T-select lever and follow the lever operation
Condition that upshift is performed under normal control
Speed control to execute deceleration fuel cut.
Priority to respond to driver demands,
The shift control is performed in accordance with the characteristics of (1). Variable for deceleration
Upshift is executed in step 9 prior to speed control
In step 10, the flag F is set to 1.
Then, from next time, we will go from step 2 to step 4.
Thus, forced shift to normal shift control (normal shift control)
To make a good return. Therefore, during the deceleration shift control, the driver
After executing the speed change control corresponding to the bar operation,
Shift from deceleration to deceleration operation until deceleration is resumed.
Control is not executed, and normal shift control is performed.
You. Steps 7 to 10 described above and the like
Steps 12 to 15 and 17 to 20 described below have various functions.
It corresponds to crop priority means. On the other hand, the driver
If the lever operation indicating the
In addition, even if the lever operation is performed, the normal shift control characteristics
When it is not a condition to upshift,
Is a deceleration shift control by bypassing steps 9 and 10.
Hold down the 3rd speed selected at
Gear shift control is continued. In step 6, the selected gear is selected in the deceleration shift control.
If it is determined that the engaged gear position is not the third speed,
Proceed to step 11 and select the gear selected in the speed reduction control.
It is determined whether or not the position is the second speed. When the gear position is 2nd gear
At some point, the driver also needs to upshift
Request to determine whether or not there is a lever operation
Performed (step 12), and
Upshifting to 3rd or 4th speed by corresponding normal control
When the conditions for shifting are performed (step 13),
An upshift corresponding to the normal control is executed (step
Step 14), then set 1 to the flag F (step
15) Return to normal control. The gear selected in the deceleration shift control is selected.
When the gear position is in the first speed (step 16), the driver
Lever operation corresponding to the upshift request
(Step 17) Normal control corresponding to such lever operation
Upshift to any of 2nd to 4th speed
If the condition is satisfied (step 18), the normal system
Execute the upshift corresponding to your control (Step 1
9) Return to normal control (step 20). In the above-described deceleration shift control, the engine
The set rotation speed at which the rotation speed N is the fuel cut start condition
N_CThe control was made so that
Setting to restart fuel supply after cutting starts
Rotation speed N_RWith the configuration that selects the gear stage so that
There may be. Also, in the above description, during the deceleration shift control, A
Only the case where the / T select lever is operated is shown,
In addition, when the mode switch is operated,
To execute the shift control giving priority to such an operation
It is good. As described above, the invention of claim 1
according to,Engine speed at which deceleration fuel cut is performed
When shifting control is performed to obtain
Even if the gear shift is such that the cut is stopped,
The ability to shift gears in response to requests
There is fruit. [0036] [0037]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of the invention according to claim 1. FIG. 2 is a system configuration diagram of the automatic transmission according to the embodiment. FIG. 3 is a flowchart showing a state of a shift control in the embodiment. FIG. 4 is a flowchart showing a state of deceleration shift control in the embodiment. FIG. 5 is a time chart for explaining a conventional problem. [Description of Signs] 1 Engine 2 Automatic transmission 3A Idle switch 3 Throttle sensor 5 Rotation sensor 6 Vehicle speed sensor 7 Gear position sensor 9 Inhibitor switch 10 Control unit

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ identification code FI F16H 59:68 F16H 59:68 (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48 B60K 41/06 F02D 41/12 330

Claims (1)

(57) [Claims] [Claim 1] A deceleration operation state exceeding a predetermined engine rotation speed
Equipped with deceleration fuel cut means for stopping fuel supply
Gear change control device of the automatic transmission connected to the engine.
Of the automatic transmission according to a preset shift pattern.
Service control means for controlling the engine speed, and the
The fuel supply is stopped by the deceleration fuel cut means.
The automatic transmission is set so that the engine speed is
A shift control device for an automatic transmission, the shift control device comprising:
During the shift control by the deceleration shift control means,
Operation to change to the range where the higher gear is selected
Is performed, the shift speed selected by the deceleration shift control means
The normal shift control means in accordance with the range change instruction.
When the gear to be selected in is higher,
Forcibly return to the normal shift control means, and from the shift speed selected by the deceleration shift control means
The normal shift control means in accordance with the range change instruction.
The gear to be selected is lower or equal
, The shift control by the deceleration shift control means
A shift control device for an automatic transmission, comprising an operation priority means for continuing the operation .